Income Taxes - Effective Tax Rate (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Income tax expense
Income tax expense (benefit)	$ (5,871)	$ 2,128	$ (1,360)	$ 5,011
Effective income tax reconciliation
Effective income tax rate, expense (benefit)	(9.80%)	46.60%	(2.80%)	46.60%