Income Taxes - Current and Deferred (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current:
State	$ 2,871	$ 8,227	$ 9,401
Current Income Tax Expense (Benefit), Total	14,780	89,865	302,313
Deferred:
State	(22,673)	(7,142)	(19,401)
Deferred Income Tax Expense (Benefit), Total	(201,611)	(187,903)	(239,647)
Total income tax expense (benefit)	(186,831)	(98,038)	62,666
United States
Current:
Federal tax	(19,937)	5,088	183,840
Deferred:
Federal	(164,297)	(182,518)	(211,119)
Outside the U.S
Current:
Federal tax	31,846	76,550	109,072
Deferred:
Federal	$ (14,641)	$ 1,757	$ (9,127)