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Debt Obligations - Borrowings under Current and Prior Credit Facility and Applicable Interest Rates (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Debt Disclosure [Abstract]    
Maximum amount outstanding $ 363,054 $ 2,024,473
Average daily amount outstanding $ 214,389 $ 1,458,311
Weighted-average interest rate 2.18% 3.11%