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Debt Obligations - Borrowings under Current and Prior Credit Facility and Applicable Interest Rates (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Debt Disclosure [Abstract]        
Maximum amount outstanding $ 576,993 $ 1,742,995 $ 576,993 $ 2,023,326
Average daily amount outstanding $ 449,132 $ 1,481,378 $ 332,409 $ 1,465,994
Weighted-average interest rate 1.90% 1.65% 1.99% 2.37%