Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Taxes
Income tax expense (benefit)	$ 2,116	$ 1,284	$ 3,155	$ 5,026
Effective tax rate (as a percent)	45.10%	56.70%	41.90%	40.00%