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Financing Arrangements, Portfolio Investments - Outstanding Repurchase Agreement Borrowings by Contractual Maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Assets Sold under Agreements to Repurchase [Line Items]    
Outstanding financing agreements $ 608,304 $ 773,142
Within 30 days    
Assets Sold under Agreements to Repurchase [Line Items]    
Outstanding financing agreements 608,304 729,134
Over 30 days to 90 days    
Assets Sold under Agreements to Repurchase [Line Items]    
Outstanding financing agreements 0 44,008
Over 90 days    
Assets Sold under Agreements to Repurchase [Line Items]    
Outstanding financing agreements $ 0 $ 0