Income Taxes Provision for Taxes (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:
Federal									$ 0	$ 0	$ 0
State taxes									262	379	289
Foreign taxes									17,926	4,421	5,359
Total current									18,188	4,800	5,648
Deferred:
Federal									0	0	(1,867)
State taxes									0	0	131
Total deferred									0	0	(1,736)
(Provision) benefit for income taxes	$ 2,414	$ 9,655	$ 5,927	$ 192	$ 4,174	$ 337	$ 119	$ 170	$ 18,188	$ 4,800	$ 3,912