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Financial Assets and Liabilities - Gross Obligations For Securities Lending Transactions (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Fair value measurements measured on a recurring basis |  |
Remaining contractual maturity for repurchase agreements | $ 265,401 | $ 390,642
Remaining contractual maturity for securities lending transactions | 936,061 | 754,687
Overnight and Continuous |  |
Fair value measurements measured on a recurring basis |  |
Remaining contractual maturity for repurchase agreements | 401 | 642
Remaining contractual maturity for securities lending transactions | 936,061 | 754,687
Less than 30 Days |  |
Fair value measurements measured on a recurring basis |  |
Remaining contractual maturity for repurchase agreements | 0 | 100,000
Remaining contractual maturity for securities lending transactions | 0 | 0
30 To 60 Days |  |
Fair value measurements measured on a recurring basis |  |
Remaining contractual maturity for repurchase agreements | 65,000 | 90,000
Remaining contractual maturity for securities lending transactions | 0 | 0
61 To 90 Days |  |
Fair value measurements measured on a recurring basis |  |
Remaining contractual maturity for repurchase agreements | 200,000 | 200,000
Remaining contractual maturity for securities lending transactions | 0 | 0
Equities |  |
Fair value measurements measured on a recurring basis |  |
Remaining contractual maturity for repurchase agreements | 265,401 | 390,000
Remaining contractual maturity for securities lending transactions | 936,061 | 754,687
Equities | Overnight and Continuous |  |
Fair value measurements measured on a recurring basis |  |
Remaining contractual maturity for repurchase agreements | 401 | 0
Remaining contractual maturity for securities lending transactions | 936,061 | 754,687
Equities | Less than 30 Days |  |
Fair value measurements measured on a recurring basis |  |
Remaining contractual maturity for repurchase agreements | 0 | 100,000
Remaining contractual maturity for securities lending transactions | 0 | 0
Equities | 30 To 60 Days |  |
Fair value measurements measured on a recurring basis |  |
Remaining contractual maturity for repurchase agreements | 65,000 | 90,000
Remaining contractual maturity for securities lending transactions | 0 | 0
Equities | 61 To 90 Days |  |
Fair value measurements measured on a recurring basis |  |
Remaining contractual maturity for repurchase agreements | 200,000 | 200,000
Remaining contractual maturity for securities lending transactions | 0 | 0
U.S. and Non-U.S. government obligations |  |
Fair value measurements measured on a recurring basis |  |
Remaining contractual maturity for repurchase agreements | 0 | 642
U.S. and Non-U.S. government obligations | Overnight and Continuous |  |
Fair value measurements measured on a recurring basis |  |
Remaining contractual maturity for repurchase agreements |  | 642
U.S. and Non-U.S. government obligations | Less than 30 Days |  |
Fair value measurements measured on a recurring basis |  |
Remaining contractual maturity for repurchase agreements | 0 | 0
U.S. and Non-U.S. government obligations | 30 To 60 Days |  |
Fair value measurements measured on a recurring basis |  |
Remaining contractual maturity for repurchase agreements | 0 | 0
U.S. and Non-U.S. government obligations | 61 To 90 Days |  |
Fair value measurements measured on a recurring basis |  |
Remaining contractual maturity for repurchase agreements | $ 0 | $ 0

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