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Long-Term Debt - 5 1/2% Senior Notes (Details) - 5½% Senior Notes [Member] - USD ($) $ in Millions | 12 Months Ended |
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Dec. 31, 2018 | Sep. 09, 2013
Senior Notes [Member] |  |
Debt Instrument, Face Amount |  | $ 300
Debt Instrument Offering Price Percentage |  | 100.00%
Redemption Price Percent If Change In Control Occurs in Addition to Accrued and Unpaid Interest |  | 101.00%
Debt Instrument, Redemption, Period One [Member] |  |
Debt Instrument, Redemption Price, Percentage in Addition to Accrued and Unpaid Interest | 101.375% |
Debt Instrument, Redemption - After Aug 1, 2019 |  |
Debt Instrument, Redemption Price, Percentage in Addition to Accrued and Unpaid Interest | 100.00% |

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