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Employee Stock and Benefit Plans (Narrative) (Details) (USD $)
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12 Months Ended |
0 Months Ended |
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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Apr. 23, 2012
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Apr. 24, 2012
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| Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term in Years, Maximum |
4.81 |
4.81 |
4.78 |
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| Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term in Years, Minimum |
4.78 |
4.78 |
4.65 |
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| Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum |
0.00% |
0.00% |
0.00% |
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| Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum |
0.00% |
0.00% |
0.00% |
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| Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum |
0.00% |
0.00% |
0.00% |
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| Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum |
0.00% |
0.00% |
0.00% |
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| Expected dividend yield |
0.00% |
0.00% |
0.00% |
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| Stock based compensation maximum limit |
64,933,332 |
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| Remaining Authorized Shares |
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$ 9,731,179 |
| Share-based Compensation Agreements, Maximum Contractual Term |
10 years |
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| Number of shares limit in aggregate shares made by chief executive officer |
1,000,000 |
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| Number of restricted stock shares limit in aggregate made by chief executive officer |
500,000 |
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| Share-based payment expense related to stock options |
4,000,000 |
9,000,000 |
20,300,000 |
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| Share-based payment expense related to restricted stock |
10,400,000 |
20,000,000 |
22,200,000 |
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| Employee Service Share Based Compensation Cash Received From Exercise Of Stock Options And Other Awards |
86,000 |
1,000,000 |
2,000,000 |
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| Total fair value of options vested |
16,400,000 |
39,100,000 |
54,300,000 |
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| Weighted average fair value of the stock option awards on their grant dates |
$ 0.01 |
$ 4.64 |
$ 7.31 |
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| Total fair value of restricted stock vested |
1,200,000 |
7,700,000 |
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| Weighted average fair value of the restricted stock awards on their grant dates |
$ 0.85 |
$ 8.69 |
$ 16.97 |
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| Stock Options [Member] |
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| Stock options, granted |
1,752,921 |
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1,752,921 |
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| Unrecognized compensation cost |
5,200,000 |
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| Recognized over a weighted average period |
|
1 year 3 months 8 days |
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| Restricted Stock [Member] |
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| Restricted stock, granted |
3,605,538 |
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2,271,555 |
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| Unrecognized compensation cost |
$ 7,800,000 |
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| Recognized over a weighted average period |
1 year 6 months 8 days |
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| Restricted stock shares, vested |
1,140,667 |
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| Weighted average fair value of the restricted stock awards on their grant dates |
$ 16.80 |
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