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Long-Term Debt - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Debt Instrument [Line Items]          
Interest expense $ 4,832 $ 4,831 $ 14,493 $ 14,490  
Senior Notes          
Debt Instrument [Line Items]          
Interest expense 4,777 4,777 14,330 14,330  
Accrued interest 1,342   1,342   $ 1,342
Amortization expense, debt issuance costs $ 55 $ 54 $ 163 $ 160  
2013 Senior Notes | Senior Notes          
Debt Instrument [Line Items]          
Redemption price, percentage     100.00%    
Minimum | 2013 Senior Notes | Senior Notes          
Debt Instrument [Line Items]          
Prior notice to be given before redemption date     30 days    
Maximum | 2013 Senior Notes | Senior Notes          
Debt Instrument [Line Items]          
Prior notice to be given before redemption date     60 days