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Long-Term Debt Loss on Early Extinguishment of Debt (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Extinguishment of Debt [Line Items] |  |  |
Loss on early extinguishments and modifications of debt | $ 1,582 | $ 42,364 | $ 40,733
Parent Only [Member] | Senior Notes |  |  |
Extinguishment of Debt [Line Items] |  |  |
Extinguishment of Debt, Amount | 0 | 0 | 23,962
Parent Only [Member] | Bank Credit Facility |  |  |
Extinguishment of Debt [Line Items] |  |  |
Extinguishment of Debt, Amount | 0 | 9,512 | 2,086
Premium and Consent Fees [Member] | Parent Only [Member] | Senior Notes |  |  |
Extinguishment of Debt [Line Items] |  |  |
Extinguishment of Debt, Amount | 0 | 15,750 | 0
Senior Notes Due 2020 [Member] | Parent Only [Member] | Senior Notes |  |  |
Extinguishment of Debt [Line Items] |  |  |
Extinguishment of Debt, Amount | 0 | 5,976 | 0
Senior Secured Notes Due 2018 [Member] | Parent Only [Member] | Senior Notes |  |  |
Extinguishment of Debt [Line Items] |  |  |
Extinguishment of Debt, Amount | 0 | 4,497 | 0
Senior Notes Due 2018 [Member] | Parent Only [Member] | Senior Notes |  |  |
Extinguishment of Debt [Line Items] |  |  |
Extinguishment of Debt, Amount | 0 | 0 | 4,888
Holdco Note | Parent Only [Member] | Promissory Note [Member] |  |  |
Extinguishment of Debt [Line Items] |  |  |
Extinguishment of Debt, Amount | 0 | 0 | 7,819
Bank Credit Facility | Parent Only [Member] | Bank Credit Facility |  |  |
Extinguishment of Debt [Line Items] |  |  |
Extinguishment of Debt, Amount | 1,086 | 6,629 | 1,978
Amended Credit Facility | Parent Only [Member] | Bank Credit Facility |  |  |
Extinguishment of Debt [Line Items] |  |  |
Extinguishment of Debt, Amount | $ 496 | $ 0 | $ 0

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- Definition Gain loss on early retirements of debt + References No definition available. + Details
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- Definition Gross amount of debt extinguished. + References No definition available. + Details
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