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Financing Agreement - Summary of Activity Under Credit Arrangements, Excluding Acquired Borrowings (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Debt Disclosure [Abstract]      
Total borrowings at December 31 $ 1,600,183 $ 1,862,631 $ 883,000
Average outstanding borrowings during year 1,911,982 1,474,485 1,133,641
Maximum outstanding borrowings during year $ 2,127,940 $ 1,999,731 $ 1,319,105
Interest rate at December 31 3.29% 3.64% 2.91%