Income Taxes Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Contingency [Line Items]
Unrecognized tax benefits	$ 28,146	$ 28,615	$ 26,433
Gross increase to positions in prior years	6,461	2,749	2,154
Gross decrease to positions in prior years	(2,512)	(1,641)	(536)
Gross increases to current period tax positions	25,741	3,008	1,670
Audit settlements	0	0	0
Decrease related to lapsing of statute of limitations	(908)	(1,715)	(817)
Effect of change in exchange rates	(2,048)	(2,870)	(289)
The amount of unrecognized tax benefits that, if recognized, would affect our effective tax rate	53,602	26,980	27,694
Net interest and penalties expense (benefit)	(880)	(469)	1,443
Accrued interest	2,105	1,755
Accrued penalties	2,577	2,671
Unrecognized tax benefits	$ 54,880	$ 28,146	$ 28,615