Income Tax Contingencies (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Income Tax Contingency [Line Items]
Net interest and penalties expense	$ 591	$ 170	$ 923	$ 645
Accrued interest	2,733		2,733		$ 2,105
Accrued penalties	3,070		3,070		2,577
Unrecognized tax benefits related to uncertain tax positions	56,216		56,216		54,880
The amount of unrecognized tax benefits that, if recognized, would affect our effective tax rate	$ 54,908		$ 54,908		$ 53,602