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Interest Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Interest and Debt Expense [Abstract]          
Interest Expense, Debt $ 19,300 $ 31,389 $ 43,392 $ 63,509  
Accretion of fair value adjustment on Senior Notes 549 549 1,098 1,098  
Amortization of Debt Issuance Costs 1,031 1,031 2,062 2,062  
Interest Expense, Total $ 20,880 $ 32,969 $ 46,552 $ 66,669  
Line of Credit Facility, Interest Rate During Period     4.50%   5.90%