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Financing Arrangements, Portfolio Investments - Outstanding Repurchase Agreement Borrowings by Contractual Maturity (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Outstanding repurchase agreement by contractual maturity $ 577,413 $ 651,965
Within 30 days    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Outstanding repurchase agreement by contractual maturity 468,402 157,008
Over 30 days to 90 days    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Outstanding repurchase agreement by contractual maturity 85,423 494,957
Over 90 days    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Outstanding repurchase agreement by contractual maturity $ 23,588 $ 0