Income Taxes Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Operating Loss Carryforwards [Line Items]
Unrecognized tax benefits, period increase (decrease)			$ 594	$ 9,337
Income tax expense	$ 1,877	$ 4,010	$ 5,410	$ 11,547
Document Period End Date			Sep. 30, 2015