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Long-Term Debt - 5% Senior Notes (Details) - USD ($) |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 16, 2018 | Apr. 03, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Sep. 09, 2013
Debt, Long-term and Short-term, Combined Amount |  |  |  |  |  | $ 2,317,723,000 | $ 2,564,270,000 |  |
Gain (Loss) on Extinguishment of Debt |  |  | $ (2,500,000) | $ (4,400,000) | $ (2,700,000) | (2,493,000) | (7,052,000) | $ 0 |
Senior Notes [Member] | Five Percent Senior Notes due 2020 [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage in Addition to Accrued and Unpaid Interest | 100.00% | 101.25% |  |  |  |  |  |  |
Early Repayment of Senior Debt | $ 280,000,000 | $ 220,000,000.0 |  |  |  |  |  |  |
Gain (Loss) on Extinguishment of Debt |  |  | $ (1,400,000) | $ (4,400,000) |  |  |  |  |
Senior Notes [Member] | Five and One Half Percent Senior Notes due 2022 [Member] |  |  |  |  |  |  |  |  |
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, Face Amount |  |  |  |  |  |  |  |  | $ 300,000,000
Five Percent Senior Notes due 2020 [Member] |  |  |  |  |  |  |  |  |
Debt, Long-term and Short-term, Combined Amount |  |  |  |  |  | $ 0 | $ 280,000,000 | $ 500,000,000 |
Debt Instrument, Redemption, Period One [Member] | Five and One Half Percent Senior Notes due 2022 [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage in Addition to Accrued and Unpaid Interest |  |  |  |  |  | 101.375% |  |  |

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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