Equity (Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 546,128
Income tax benefit (expense)	52,374	$ (70,806)	$ (81,281)
Ending balance	347,435	546,128
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(7,797)	(7,917)	(17,448)
Change in OCI before reclassifications	(3,891)	599	9,572
Amounts reclassified from AOCI	0	0	0
Income tax benefit (expense)	414	(479)	(41)
Ending balance	(11,274)	(7,797)	(7,917)
Net Unrealized Investment Gains (Losses)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	553,925	289,359	(10,848)
Change in OCI before reclassifications	(222,182)	327,819	435,919
Amounts reclassified from AOCI	(24,994)	7,074	(54,472)
Income tax benefit (expense)	51,960	(70,327)	(81,240)
Ending balance	358,709	553,925	289,359
Total Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	546,128	281,442	(28,296)
Change in OCI before reclassifications	(226,073)	328,418	445,491
Amounts reclassified from AOCI	(24,994)	7,074	(54,472)
Income tax benefit (expense)	52,374	(70,806)	(81,281)
Ending balance	347,435	546,128	281,442
Cash flow hedges | Net Unrealized Investment Gains (Losses)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(8,000)	26,000
Ending balance	$ 40,000	$ (8,000)	$ 26,000