Quarterly report pursuant to Section 13 or 15(d)

Debt Obligations - Borrowings under Current and Prior Credit Facility and Applicable Interest Rates (Details)

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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, 2019
Mar. 31, 2018
Debt Disclosure [Abstract]    
Maximum amount outstanding under the credit facility during the period $ 1,453,150 $ 936,012
Average daily amount outstanding under the credit facility $ 1,264,498 $ 684,947
Weighted-average interest rate 3.92% 3.34%