Income Taxes Income Tax Contingencies (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Income Tax Contingency [Line Items]
Net interest and penalties expense	$ 174	$ 1,782	$ 475	$ 1,239
Accrued interest	1,860		1,860		$ 1,755
Accrued penalties	2,682		2,682		2,671
Unrecognized tax benefits related to uncertain tax positions	28,097		28,097		28,146
The amount of unrecognized tax benefits that, if recognized, would affect our effective tax rate	$ 26,864		$ 26,864		$ 26,980