Income Taxes - Provision For Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current tax expense (benefit):
U.S. Federal	$ (37,854)	$ (32,272)	$ 17,086
State	20	(34)	2,170
Foreign	10,440	11,411	9,925
Total current	(27,394)	(20,895)	29,181
Deferred tax expense (benefit):
U.S. Federal	2,670	(2,624)	12,237
State	(181)	179	(174)
Foreign	863	1,942	(196)
Total deferred	3,352	(503)	11,867
Total income tax expense (benefit)	$ (24,042)	$ (21,398)	$ 41,048