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Debt - Debt Issuance Costs (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Debt Disclosure [Abstract]      
Non-cash interest expense $ 10,103 $ 10,370 $ 11,187
Deferred financing costs 669 1,368 $ 61
Unamortized balances of deferred financing costs $ 53,292 $ 62,911