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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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