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Financial Assets and Liabilities - Gross Obligations For Securities Lending Transactions (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Remaining contractual maturity for securities sold under agreements to repurchase $ 290,000 $ 281,861
Remaining contractual maturity for securities loaned 819,903 1,130,039
Overnight and Continuous    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Remaining contractual maturity for securities sold under agreements to repurchase 0 11,861
Remaining contractual maturity for securities loaned 819,903 1,130,039
Less than 30 days    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Remaining contractual maturity for securities sold under agreements to repurchase 90,000 45,000
Remaining contractual maturity for securities loaned 0 0
30 - 60 days    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Remaining contractual maturity for securities sold under agreements to repurchase 40,000 65,000
Remaining contractual maturity for securities loaned 0 0
61 - 90 Days    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Remaining contractual maturity for securities sold under agreements to repurchase 160,000 160,000
Remaining contractual maturity for securities loaned 0 0
Equity securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Remaining contractual maturity for securities sold under agreements to repurchase 290,000 270,000
Remaining contractual maturity for securities loaned 819,903 1,130,039
Equity securities | Overnight and Continuous    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Remaining contractual maturity for securities sold under agreements to repurchase 0 0
Remaining contractual maturity for securities loaned 819,903 1,130,039
Equity securities | Less than 30 days    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Remaining contractual maturity for securities sold under agreements to repurchase 90,000 45,000
Remaining contractual maturity for securities loaned 0 0
Equity securities | 30 - 60 days    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Remaining contractual maturity for securities sold under agreements to repurchase 40,000 65,000
Remaining contractual maturity for securities loaned 0 0
Equity securities | 61 - 90 Days    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Remaining contractual maturity for securities sold under agreements to repurchase 160,000 160,000
Remaining contractual maturity for securities loaned 0 0
U.S. and Non-U.S. government obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Remaining contractual maturity for securities sold under agreements to repurchase 0 11,861
U.S. and Non-U.S. government obligations | Overnight and Continuous    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Remaining contractual maturity for securities sold under agreements to repurchase 0 11,861
U.S. and Non-U.S. government obligations | Less than 30 days    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Remaining contractual maturity for securities sold under agreements to repurchase 0 0
U.S. and Non-U.S. government obligations | 30 - 60 days    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Remaining contractual maturity for securities sold under agreements to repurchase 0 0
U.S. and Non-U.S. government obligations | 61 - 90 Days    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Remaining contractual maturity for securities sold under agreements to repurchase $ 0 $ 0