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Financing Arrangements, Portfolio Investments - Outstanding Repurchase Agreement Borrowings by Contractual Maturity (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Assets Sold under Agreements to Repurchase [Line Items]    
Outstanding financing agreements $ 1,287,314 $ 1,276,918
Within 30 days    
Assets Sold under Agreements to Repurchase [Line Items]    
Outstanding financing agreements 539,990 1,081,911
Over 30 days to 90 days    
Assets Sold under Agreements to Repurchase [Line Items]    
Outstanding financing agreements 647,324 95,007
Over 90 days    
Assets Sold under Agreements to Repurchase [Line Items]    
Outstanding financing agreements $ 100,000 $ 100,000