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Long-Term Debt Loss on Early Extinguishment of Debt (Details) - USD ($)
$ in Thousands
 12 Months Ended
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