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Income Taxes - Income Tax Benefit (Expense) from Continuing Operations (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current portion of income tax expense:
Federal									$ 0	$ 0	$ 0
State									458	20	296
Current portion of income tax expense									458	20	296
Deferred portion of income tax (benefit) expense:
Federal									(61,396)	0	0
State									0	0	0
Deferred portion of income tax (benefit) expense									(61,396)	0	0
Total income tax (benefit) expense	$ (61,673)	$ 583	$ 99	$ 53	$ (131)	$ 44	$ 63	$ 44	$ (60,938)	$ 20	$ 296
Effective tax rate									(166.00%)	0.00%	18.00%

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