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Long-Term Debt 5% Senior Notes (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Apr. 03, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Mar. 23, 2012
Gain (Loss) on Extinguishment of Debt |  | $ (4,400,000) | $ (2,700,000) | $ (7,052,000) | $ 0 | $ 0 |
Senior Notes [Member] | Five Percent Senior Notes due 2020 [Member] |  |  |  |  |  |  |
Debt Instrument Offering Price Percentage |  |  |  |  |  |  | 100.00%
Debt Instrument, Redemption Price, Percentage in Addition to Accrued and Unpaid Interest | 101.25% |  |  |  |  |  |
Redemption Price Percent If Change In Control Occurs in Addition to Accrued and Unpaid Interest |  |  |  |  |  |  | 101.00%
Debt Instrument, Face Amount |  |  |  |  |  |  | $ 500,000,000
Early Repayment of Senior Debt | $ 220,000,000.0 |  |  |  |  |  |
Gain (Loss) on Extinguishment of Debt |  | $ (4,400,000) |  |  |  |  |
Debt Instrument, Redemption - Current Percent | Five Percent Senior Notes due 2020 [Member] |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage in Addition to Accrued and Unpaid Interest |  |  |  | 101.25% |  |  |
Debt Instrument, Redemption - After April 1, 2018 | Five Percent Senior Notes due 2020 [Member] |  |  |  |  |  |  |
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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