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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