Income Taxes Provision for Taxes (Details) - USD ($) $ in Thousands	3 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	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current:
Federal									$ 0	$ 0	$ 0
State taxes									379	289	113
Foreign taxes									4,421	5,359	4,405
Total current									4,800	5,648	4,518
Deferred:
Federal									0	(1,867)	(26,151)
State taxes									0	131	(325)
Total deferred									0	(1,736)	(26,476)
(Provision) benefit for income taxes	$ 4,174	$ 337	$ 119	$ 170	$ 450	$ 145	$ 4,689	$ (1,372)	$ 4,800	$ 3,912	$ (21,958)