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Employee Stock and Benefit Plans (Summary of the Status of Non-Vested Restricted Stock Awards) (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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| Non-vested restricted stock awards, Vested, Weighted Average Grant Date Fair Value Per Share |
$ 0.85 |
$ 8.69 |
$ 16.97 |
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| Restricted Stock [Member] |
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| Number of Non-vested restricted stock awards, beginning balance |
4,089,748.000 |
3,919,485.000 |
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| Non-vested restricted stock awards, Weighted Average Grant Date Fair Value Per Share, beginning balance |
$ 3.75 |
$ 12.99 |
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| Non-vested restricted stock awards, Granted, Number of Shares |
3,605,538 |
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|
2,271,555 |
| Non-vested restricted stock awards, Granted, Weighted Average Grant Date Fair Value Per Share |
$ 0.85 |
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| Non-vested restricted stock awards, Vested, Number of Shares |
(1,140,667) |
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| Non-vested restricted stock awards, Vested, Weighted Average Grant Date Fair Value Per Share |
$ 16.80 |
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| Non-vested restricted stock awards, Forfeited, Number of Shares |
(2,294,608) |
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| Non-vested restricted stock awards, Forfeited, Weighted Average Grant Date Fair Value Per Share |
$ 7.69 |
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| Number of Non-vested restricted stock awards, ending balance |
4,089,748.000 |
3,919,485.000 |
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| Non-vested restricted stock awards, Weighted Average Grant Date Fair Value Per Share, ending balance |
$ 3.75 |
$ 12.99 |
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