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Long-Term Debt - 5 1/2% Senior Notes (Details) - USD ($)
3 Months Ended 12 Months Ended
Aug. 01, 2019
Sep. 30, 2019
Jun. 30, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Gain (Loss) on Extinguishment of Debt   $ (1,700,000) $ (2,500,000) $ (1,676,000) $ (2,493,000) $ (7,052,000)
5½% Senior Notes [Member] | Term Loan [Member]            
Gain (Loss) on Extinguishment of Debt   $ (1,700,000)        
5½% Senior Notes [Member] | Senior Notes [Member]            
Early Repayment of Senior Debt $ 300,000,000          
Debt Instrument, Redemption Price, Percentage Plus Accrued and Unpaid Interest 100.00%