Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Income Taxes
Income tax provision (benefit)	$ (385)	$ 4,254	$ 950	$ (3,184)
Pre-tax earnings (loss)	$ 10,156	$ 10,451	$ 13,285	$ 7,803
Effective tax rate (as a percent)			7.20%	40.80%
Discrete benefits for reversal of valuation allowance for deferred tax asset			$ 4,604	$ 6,359