Income Taxes Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Operating Loss Carryforwards [Line Items]
Unrecognized tax benefits, period increase (decrease)	$ 50	$ 87
Income tax expense	$ 1,750	$ 2,397
Document Period End Date	Mar. 31, 2016