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Derivative Instruments (Details) - USD ($)
$ in Thousands

12 Months Ended

Dec. 31, 2020

Dec. 31, 2019

Dec. 31, 2018

Derivative offsetting [Abstract]

Derivative assets subject to master netting agreements

$ 138,800

$ 97,800

Derivative liabilities subject to master netting agreements

93,000

37,800

Net realized gains (losses) on derivative instruments

Net realized gains (losses) on derivative instruments

^[1]

179,675

119,741

$ 15,636

Not Designated as Hedging Instrument

Derivative [Line Items]

Asset derivatives - fair value

177,383

103,956

Liability derivatives - fair value

(108,705)

(39,750)

Net realized gains (losses) on derivative instruments

Net realized gains (losses) on derivative instruments

179,675

119,741

15,636

Not Designated as Hedging Instrument | Futures contracts

Derivative [Line Items]

Net derivatives - notional value

^[2],[3]

3,099,796

4,104,559

Net realized gains (losses) on derivative instruments

Net realized gains (losses) on derivative instruments

114,987

114,123

48,443

Not Designated as Hedging Instrument | Futures contracts | Other assets

Derivative [Line Items]

Asset derivatives - fair value

^[3]

11,046

10,065

Not Designated as Hedging Instrument | Futures contracts | Other liabilities

Derivative [Line Items]

Liability derivatives - fair value

^[3]

(4,496)

(13,722)

Not Designated as Hedging Instrument | Foreign currency forward contracts

Derivative [Line Items]

Net derivatives - notional value

^[2],[3]

1,656,729

686,878

Net realized gains (losses) on derivative instruments

Net realized gains (losses) on derivative instruments

49,974

(9,499)

(21,770)

Not Designated as Hedging Instrument | Foreign currency forward contracts | Other assets

Derivative [Line Items]

Asset derivatives - fair value

^[3]

52,716

5,352

Not Designated as Hedging Instrument | Foreign currency forward contracts | Other liabilities

Derivative [Line Items]

Liability derivatives - fair value

^[3]

(6,202)

(5,327)

Not Designated as Hedging Instrument | TBAs

Derivative [Line Items]

Net derivatives - notional value

^[2],[4]

0

53,229

Net realized gains (losses) on derivative instruments

Net realized gains (losses) on derivative instruments

1,129

463

(133)

Not Designated as Hedging Instrument | TBAs | Fixed maturities available for sale, at fair value

Derivative [Line Items]

Asset derivatives - fair value

^[4]

0

55,010

Liability derivatives - fair value

^[4]

0

0

Not Designated as Hedging Instrument | Other

Derivative [Line Items]

Net derivatives - notional value

^[2],[3]

5,763,919

4,356,300

Net realized gains (losses) on derivative instruments

Net realized gains (losses) on derivative instruments

13,585

14,654

$ (10,904)

Not Designated as Hedging Instrument | Other | Other assets

Derivative [Line Items]

Asset derivatives - fair value

^[3]

113,621

33,529

Not Designated as Hedging Instrument | Other | Other liabilities

Derivative [Line Items]

Liability derivatives - fair value

^[3]

$ (98,007)

$ (20,701)

[1]	See Note 11 for information on the Company’s derivative instruments.
[2]	Represents the absolute notional value of all outstanding contracts, consisting of long and short positions.
[3]	The fair value of asset derivatives are included in ‘other assets’ and the fair value of liability derivatives are included in ‘other liabilities.’
[4]	The fair value of TBAs are included in ‘fixed maturities available for sale, at fair value.’

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- 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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