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Interest Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Interest and Debt Expense [Abstract]          
Interest Expense, Debt $ 20,893 $ 30,222 $ 64,285 $ 93,731  
Accretion of fair value adjustment on Senior Notes 549 549 1,647 1,647  
Amortization of Debt Issuance Costs 1,032 1,032 3,094 3,094  
Interest Expense, Total $ 22,474 $ 31,803 $ 69,026 $ 98,472  
Line of Credit Facility, Interest Rate During Period     4.50%   5.30%