Selected Quarterly Financial Data (Unaudited) - Income Taxes - Income Tax Provision (Details) - USD ($) $ in Thousands	3 Months Ended												6 Months Ended			9 Months Ended			12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Provision [Abstract]
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	$ 49,455	$ 74,015	$ 50,358	$ 58,328	$ 33,245	$ (24,247)	$ (1,251)	$ 17,595	$ 26,674	$ 19,982	$ 19,982	$ 16,257	$ 108,686	$ 16,344	$ 36,239	$ 182,701	$ (7,903)	$ 56,221	$ 232,156	$ 25,342	$ 82,895
Income Tax Expense (Benefit)	16,670	26,048	17,850	20,790	15,266	(11,914)	(499)	8,101	9,996	7,777	7,345	5,415	38,640	7,602	12,760	64,688	(4,312)	20,537	81,358	10,954	30,533
Net Income (loss) From Continuing Operations, Amount	$ 32,785	$ 47,967	$ 32,508	$ 37,538	$ 17,979	$ (12,333)	$ (752)	$ 9,494	$ 16,678	$ 12,205	$ 12,637	$ 10,842	$ 70,046	$ 8,742	$ 23,479	$ 118,013	$ (3,591)	$ 35,684	$ 150,798	$ 14,388	$ 52,362
Income tax provision/benefit as a percentage of income/loss before income taxes		35.20%	35.40%	35.60%		(49.10%)	(39.90%)	46.00%		38.90%	36.80%	33.30%	35.60%	46.50%	35.20%	35.40%	(54.60%)	36.50%