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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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