v3.21.2
Long-Term Debt - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Debt Instrument [Line Items]          
Interest expense $ 4,832 $ 4,830 $ 9,663 $ 9,661  
Senior Notes          
Debt Instrument [Line Items]          
Interest expense 4,776 4,776 9,553 9,553  
Accrued interest 1,342   1,342   $ 1,342
Amortization expense, debt issuance costs $ 56 $ 54 $ 110 $ 108  
2013 Senior Notes | Senior Notes          
Debt Instrument [Line Items]          
Redemption price, percentage     100.00%    
2016 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    
Minimum | 2016 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    
Maximum | 2016 Senior Notes | Senior Notes          
Debt Instrument [Line Items]          
Prior notice to be given before redemption date     60 days