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Summary of Significant Accounting Policies - Corrections (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								6 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Jun. 30, 2015	Sep. 30, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Long-term deferred tax assets	$ 216,564	$ 208,530								$ 208,530	$ 216,564
Income tax (expense) benefit	514	219,362	$ (265)	$ (15)	$ (280)	$ (124)	$ 47	$ (53)		219,083	219,596	$ (410)	$ (374)
Net income	$ 6,341	$ 226,646	$ 23,564	$ 754	$ 7,055	$ 1,280	$ 1,592	$ 2,097		$ 250,964	$ 257,305	$ 12,024	$ 11,420
Net income, basic (in usd per share)	$ (0.32)	$ (11.40)	$ (1.19)	$ (0.04)	$ (0.35)	$ (0.06)	$ (0.08)	$ (0.10)		$ (12.71)	$ (13.00)	$ (0.59)	$ (0.56)
Net income, diluted (in USD per share)	$ (0.29)	$ (10.56)	$ (1.11)	$ (0.04)	$ (0.34)	$ (0.06)	$ (0.07)	$ (0.10)		$ (11.88)	$ (12.12)	$ (0.56)	$ (0.55)
Current contingent liabilities	$ 10,414				$ 6,796						$ 10,414	$ 6,796
Previously Reported Understatement
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Long-term deferred tax assets		$ 2,100								$ 2,100
Understatement as percent of previously reported Deferred tax assets (percent)		1.00%								1.00%
Income tax (expense) benefit		$ 2,100								$ 2,100
Net income		$ 2,100								$ 2,100
Understatement as percent of previously reported EPS (percent)		1.00%								1.00%
Current contingent liabilities			$ 600						$ 600
Previously Reported Overstatement
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income			$ 600						$ 600
Net income, basic (in usd per share)			$ (0.03)						$ (0.03)
Impact of Correction of Immaterial Errors
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income		$ (600)
Net income, basic (in usd per share)		$ 0.03
Impact of Correction
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income, basic (in usd per share)		0.11								$ 0.11
Net income, diluted (in USD per share)		$ 0.10								$ 0.10

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