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 | ||||||||