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Derivative Instruments - Fair value and notional amount of derivatives (Details) - USD ($)
$ in Thousands

Sep. 30, 2020

Dec. 31, 2019

Derivative offsetting

Derivative assets subject to master netting agreements

$ 109,700

$ 97,800

Derivative liabilities subject to master netting agreements

74,600

37,800

Not designated as hedging instrument

Derivative [Line Items]

Asset derivatives - fair value

130,494

103,956

Liability derivatives - fair value

(82,457)

(39,750)

Not designated as hedging instrument | Futures contracts

Derivative [Line Items]

Net derivatives - notional value

^[1],[2]

2,804,901

4,104,559

Not designated as hedging instrument | Futures contracts | Other assets

Derivative [Line Items]

Asset derivatives - fair value

^[2]

23,605

10,065

Not designated as hedging instrument | Futures contracts | Other liabilities

Derivative [Line Items]

Liability derivatives - fair value

^[2]

(9,357)

(13,722)

Not designated as hedging instrument | Foreign currency forward contracts

Derivative [Line Items]

Net derivatives - notional value

^[1],[2]

990,726

686,878

Not designated as hedging instrument | Foreign currency forward contracts | Other assets

Derivative [Line Items]

Asset derivatives - fair value

^[2]

11,428

5,352

Not designated as hedging instrument | Foreign currency forward contracts | Other liabilities

Derivative [Line Items]

Liability derivatives - fair value

^[2]

(3,256)

(5,327)

Not designated as hedging instrument | TBAs

Derivative [Line Items]

Net derivatives - notional value

^[1],[3]

0

53,229

Not designated as hedging instrument | TBAs | Fixed maturities available for sale

Derivative [Line Items]

Asset derivatives - fair value

^[3]

0

55,010

Liability derivatives - fair value

^[3]

0

0

Not designated as hedging instrument | Other

Derivative [Line Items]

Net derivatives - notional value

^[1],[2]

6,231,827

4,356,300

Not designated as hedging instrument | Other | Other assets

Derivative [Line Items]

Asset derivatives - fair value

^[2]

95,461

33,529

Not designated as hedging instrument | Other | Other liabilities

Derivative [Line Items]

Liability derivatives - fair value

^[2]

$ (69,844)

$ (20,701)

[1]	Represents the absolute notional value of all outstanding contracts, consisting of long and short positions.
[2]	The fair value of asset derivatives are included in ‘other assets’ and the fair value of liability derivatives are included in ‘other liabilities.’
[3]	The fair value of TBAs are included in ‘fixed maturities available for sale, at fair value.’

X

- Definition

Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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- Definition

Fair value, after offset of derivative liability, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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