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Borrowings - Short-Term Credit Facilities (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Short-Term Credit Facilities      
Interest expense $ 6,828 $ 7,101  
Short-Term Credit Facilities      
Short-Term Credit Facilities      
Weighted average interest rate 3.27%   3.12%
Interest expense $ 1,700 $ 1,700