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Stock-Based Compensations (Grants) (Details) (USD $)
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12 Months Ended | 3 Months Ended | 12 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | |||||||||
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2012
Interactive Group [Member]
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Dec. 31, 2012
Interactive Group [Member]
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Dec. 31, 2012
Interactive Group [Member]
Series A [Member]
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Aug. 09, 2012
Interactive Group [Member]
Series A [Member]
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Dec. 31, 2012
Interactive Group [Member]
Series B [Member]
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Aug. 09, 2012
Interactive Group [Member]
Series B [Member]
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Dec. 31, 2012
Interactive Group [Member]
Option Exchange [Member]
Series A [Member]
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Dec. 31, 2012
Interactive Group [Member]
Option Exchange [Member]
Series B [Member]
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Dec. 31, 2012
Interactive Group [Member]
Option Exchange [Member]
Series B [Member]
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Dec. 31, 2012
Ventures Group [Member]
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Dec. 31, 2012
Ventures Group [Member]
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Dec. 31, 2012
Ventures Group [Member]
Series A [Member]
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Aug. 09, 2012
Ventures Group [Member]
Series A [Member]
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Dec. 31, 2012
Ventures Group [Member]
Series B [Member]
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Aug. 09, 2012
Ventures Group [Member]
Series B [Member]
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Dec. 31, 2012
Ventures Group [Member]
Option Exchange [Member]
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Dec. 31, 2012
Ventures Group [Member]
Option Exchange [Member]
Series B [Member]
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Dec. 31, 2012
Ventures Group [Member]
Option Exchange [Member]
Series B [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum | 44.80% | 44.80% | Ìý | 28.20% | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | 47.50% | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ 7.32 | $ 7.11 | $ 7.15 | $ 8.44 | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | $ 26.58 | $ 27.29 | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum | 47.50% | 46.40% | Ìý | 47.50% | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | 49.90% | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Outstanding options, Beginning Balance | Ìý | Ìý | Ìý | Ìý | 45,223,000 | Ìý | 450,000 | Ìý | Ìý | Ìý | Ìý | Ìý | 0 | 1,155,000 | Ìý | 0 | Ìý | Ìý | Ìý | Ìý |
| Options granted | 6,200,000 | 10,600,000 | 20,100,000 | 3,413,000 | 3,413,000 | Ìý | 0 | Ìý | (24,706,000) | Ìý | 0 | 900,000 | 36,000 | Ìý | Ìý | 0 | Ìý | (1,174,000) | Ìý | 0 |
| Options exercised | Ìý | Ìý | Ìý | Ìý | (9,853,000) | Ìý | 0 | Ìý | 20,086,000 | Ìý | 0 | Ìý | (181,000) | Ìý | Ìý | 0 | Ìý | 905,000 | Ìý | 0 |
| Options forfeited/cancelled | Ìý | Ìý | Ìý | Ìý | (737,000) | Ìý | 0 | Ìý | Ìý | Ìý | Ìý | Ìý | (19,000) | Ìý | Ìý | 0 | Ìý | Ìý | Ìý | Ìý |
| Outstanding options, Ending Balance | Ìý | Ìý | Ìý | Ìý | 33,839,000 | Ìý | 432,000 | Ìý | Ìý | Ìý | Ìý | 1,155,000 | 1,155,000 | 1,155,000 | Ìý | 22,000 | Ìý | Ìý | Ìý | Ìý |
| Exercisable options | Ìý | Ìý | Ìý | Ìý | 12,929,000 | Ìý | 432,000 | Ìý | Ìý | Ìý | Ìý | 449,000 | 449,000 | 449,000 | Ìý | 22,000 | Ìý | Ìý | Ìý | Ìý |
| Outstanding WAEP, Beginning of Period | Ìý | Ìý | Ìý | Ìý | $ 12.06 | Ìý | $ 19.74 | Ìý | Ìý | Ìý | Ìý | Ìý | $ 0.00 | $ 56.26 | Ìý | $ 0.00 | Ìý | Ìý | Ìý | Ìý |
| WAEP granted | Ìý | Ìý | Ìý | Ìý | $ 18.85 | Ìý | $ 0.00 | Ìý | $ 10.93 | $ 0.00 | Ìý | Ìý | $ 58.49 | Ìý | Ìý | $ 0.00 | Ìý | $ 27.96 | $ 0.00 | Ìý |
| WAEP exercised | Ìý | Ìý | Ìý | Ìý | $ 9.64 | Ìý | $ 0.00 | Ìý | $ 19.26 | $ 0.00 | Ìý | Ìý | $ 30.91 | Ìý | Ìý | $ 0.00 | Ìý | $ 58.80 | $ 0.00 | Ìý |
| WAEP forfeited/cancelled | Ìý | Ìý | Ìý | Ìý | $ 14.44 | Ìý | $ 0.00 | Ìý | Ìý | Ìý | Ìý | Ìý | $ 34.05 | Ìý | Ìý | $ 0.00 | Ìý | Ìý | Ìý | Ìý |
| Options Adjustment from Recapitalization | Ìý | Ìý | Ìý | Ìý | Ìý | 413,000 | Ìý | (18,000) | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | 1,588,000 | Ìý | 22,000 | Ìý | Ìý | Ìý |
| Weighted Average Exercise Price of Adjusted Options from Recapitalization | Ìý | Ìý | Ìý | Ìý | Ìý | $ 8.39 | Ìý | $ 17.92 | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | $ 30.69 | Ìý | $ 46.69 | Ìý | Ìý | Ìý |
| Outstanding WAEP, End of Period | Ìý | Ìý | Ìý | Ìý | $ 16.92 | Ìý | $ 17.92 | Ìý | Ìý | Ìý | Ìý | $ 56.26 | $ 56.26 | $ 56.26 | Ìý | $ 46.69 | Ìý | Ìý | Ìý | Ìý |
| Exercisable WAEP | Ìý | Ìý | Ìý | Ìý | $ 15.56 | Ìý | $ 17.92 | Ìý | Ìý | Ìý | Ìý | $ 52.91 | $ 52.91 | $ 52.91 | Ìý | $ 46.69 | Ìý | Ìý | Ìý | Ìý |