Income Taxes Income Tax Contingencies (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Income Tax Contingency [Line Items]
Net interest and penalties expense	$ 170	$ 237	$ 645	$ 1,476
Accrued interest	1,886		1,886		$ 1,755
Accrued penalties	2,585		2,585		2,671
Unrecognized tax benefits related to uncertain tax positions	32,973		32,973		28,146
The amount of unrecognized tax benefits that, if recognized, would affect our effective tax rate	$ 31,660		$ 31,660		$ 26,980