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 provision (benefit)	$ 3,516	$ 2,763	$ 4,466	$ (421)
Pre-tax earnings (loss)	$ 8,001	$ 7,850	$ 21,286	$ 15,653
Effective tax rate (as a percent)			21.00%	2.70%
Discrete benefits for reversal of valuation allowance for deferred tax asset			$ 4,607	$ 6,359