Income Taxes Net Income (Loss) Domestic and Foreign (Details) - USD ($) $ in Thousands	3 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, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
United States									$ 147,427	$ 165,289	$ 122,193
Foreign									(2,109)	0	0
Total income before income taxes	$ 9,638	$ 27,066	$ 22,638	$ 30,046	$ 21,154	$ 27,713	$ 21,911	$ 31,153	89,388	101,931	78,236
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest									$ 145,318	$ 165,289	$ 122,193