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Debt (6.625% Senior Notes) (Details) - USD ($) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Apr. 18, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Mar. 19, 2013 | Feb. 10, 2011
Debt Instrument [Line Items] |  |  |  |  |  |
Loss on extinguishment of debt |  | $ 0 | $ 0 | $ 15,885,000 |  |
Senior Notes | 6.625% Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated interest rate |  | 6.625% | 6.625% |  | 6.00% | 6.625%
Debt instrument, face amount |  |  |  |  |  | $ 300,000,000
Repurchase amount | $ 231,000,000 |  |  |  |  |
Loss on extinguishment of debt | $ 15,900,000 |  |  |  |  |

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