Income Taxes Income Tax Contingencies (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Income Tax Contingency [Line Items]
Net interest and penalties expense	$ 237	$ 453	$ 1,476	$ 792
Accrued interest	2,093		2,093		2,078
Accrued penalties	4,168		4,168		3,075
Unrecognized tax benefits related to uncertain tax positions	35,643		35,643		28,615
The amount of unrecognized tax benefits that, if recognized, would affect our effective tax rate	$ 34,578		$ 34,578		$ 27,694