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Borrowings - Short-Term Credit Facilities (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Short-Term Credit Facilities      
Borrowing Outstanding $ 1,156,932    
Interest expense $ 19,047 $ 6,828  
Short-Term Credit Facilities      
Short-Term Credit Facilities      
Weighted average interest rate 4.04%   3.86%
Financing Available $ 535,000   $ 543,000
Borrowing Outstanding 131,382   $ 205,677
Interest expense $ 1,500 $ 1,700