Income Taxes Income Tax Contingencies (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Income Tax Contingency [Line Items]
Net interest and penalties expense	$ 1,782	$ 168	$ 1,239	$ 339
Accrued interest	2,020		2,020		2,078
Accrued penalties	4,426		4,426		3,075
Unrecognized tax benefits related to uncertain tax positions	39,262		39,262		28,615
The amount of unrecognized tax benefits that, if recognized, would affect our effective tax rate	$ 38,044		$ 38,044		$ 27,694