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Quarterly Financial Information (unaudited) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified |
3 Months Ended | 12 Months Ended | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2013
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Sep. 30, 2013
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Jun. 30, 2013
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Mar. 31, 2013
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Dec. 31, 2012
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Sep. 30, 2012
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Jun. 30, 2012
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Mar. 31, 2012
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Quarterly Financial Information (unaudited) [Abstract] | |||||||||||||||||||||
| Total revenues | $ 12,535 | $ 6,312 | $ 7,151 | $ 9,453 | $ 7,391 | $ 7,251 | $ 9,275 | $ 9,865 | $ 35,451 | $ 33,782 | $ 58,196 | ||||||||||
| Total operating costs and expenses | (28,114) | (23,535) | (21,230) | (20,777) | (20,010) | (23,404) | (22,765) | (24,227) | (93,656) | (90,406) | (92,151) | ||||||||||
| Other (expense) income, net (1) | (36,719) | [1] | (12,416) | [1] | (3,169) | [1] | (13,563) | [1] | 14,985 | [1] | (10,772) | [1] | (2,665) | [1] | (16,063) | [1] | |||||
| Income tax benefit | (1) | 15 | 0 | 0 | 0 | 74 | 0 | 0 | 14 | 74 | (15) | ||||||||||
| Net (loss) income | $ (52,299) | $ (29,624) | $ (17,248) | $ (24,887) | $ 2,366 | $ (26,851) | $ (16,155) | $ (30,425) | $ (124,058) | $ (71,065) | $ (32,743) | ||||||||||
| Basic and diluted net (loss) income per share of common stock (in dollars per share) | $ (0.55) | $ (0.34) | $ (0.21) | $ (0.30) | $ 0.03 | $ (0.39) | $ (0.24) | $ (0.69) | $ (1.43) | $ (1.10) | $ (1.04) | ||||||||||
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