Income Taxes - Provision (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Tax Disclosure [Abstract]
Income (loss) before income taxes	$ (1,937)	$ 75,214	$ 70,139	$ 222,061
Income tax provision	960	27,305	29,472	70,273
CONSOLIDATED NET INCOME (LOSS)	$ (2,897)	$ 47,909	$ 40,667	$ 151,788
Income tax provision as a percentage of income (loss) before income taxes	(49.60%)	36.30%	42.00%	31.60%