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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, 2020
Mar. 31, 2019
Debt Disclosure [Abstract]    
Maximum amount outstanding under the credit facility during the period $ 2,024,473 $ 1,453,150
Average daily amount outstanding under the credit facility $ 1,458,311 $ 1,264,498
Weighted-average interest rate 3.11% 3.92%