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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

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