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Summary of Significant Accounting Policies - Accrued Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Accounting Policies [Abstract]    
Accrued interest $ 20,629 $ 14,024
Accrued salaries, wages and benefits 4,164 3,143
Accrued sales taxes 1,444 1,724
Other 1,353 1,492
Accrued liabilities $ 27,590 $ 20,383