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Notes Payable, Long-Term Debt and Other Obligations (Non-Cash Interest Expense) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Feb. 01, 2021
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Debt Instrument [Line Items]          
Amortization of debt discount, net   $ 97 $ 847 $ 191 $ 5,447
Amortization of debt issuance costs   942 889 1,835 2,047
Loss on extinguishment of debt   0 0 21,362 0
Non-cash interest expense   $ 1,039 1,736 $ 10,375 7,494
6.125% Senior Secured Notes due 2025 | Senior Notes          
Debt Instrument [Line Items]          
Interest rate 6.125% 6.125%   6.125%  
Loss on extinguishment of debt $ (21,362) $ 0 $ 0 $ 8,349 $ 0