Short-Term Financing - Summary of Short Term Financing and Weighted Average Interest Rate on Borrowings (Details) - USD ($) $ in Thousands |
Dec. 31, 2015 |
Dec. 31, 2014 |
---|---|---|
Short-term Debt [Line Items] | ||
Oustanding Balance | $ 446,190 | $ 377,767 |
Commercial paper (secured) | ||
Short-term Debt [Line Items] | ||
Oustanding Balance | $ 276,894 | $ 238,013 |
Weighted Average Interest Rate | 1.7376% | 1.48% |
Prime broker arrangement | ||
Short-term Debt [Line Items] | ||
Oustanding Balance | $ 169,296 | $ 127,754 |
Weighted Average Interest Rate | 1.0745% | 0.91% |
Bank lines (secured) | ||
Short-term Debt [Line Items] | ||
Oustanding Balance | $ 0 | $ 12,000 |
Weighted Average Interest Rate | 1.50% |