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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, 2017 | 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 - After August 1, 2017 |  |
Debt Instrument, Redemption Price, Percentage in Addition to Accrued and Unpaid Interest | 102.75% |
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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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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