Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Taxes
Income tax expense (benefit)	$ 2,418	$ (399)	$ 5,470	$ 547
Effective tax rate (as a percent)	41.80%	45.10%	42.60%	38.50%