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Shareholders' Equity (Roll Forward of AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 1,424,040	$ 1,474,390	$ 1,349,210	$ 1,511,913
OCI, before reclassifications, net of tax	(10,158)	9,483	(24,647)	36,990
Amounts reclassified from AOCI, net of tax	(1,407)	(2,328)	(9,073)	(5,660)
Net OCI, current period	(11,565)	7,155	(33,720)	31,330
Ending balance	1,423,102	1,329,893	1,423,102	1,329,893
Unrealized Investment Gains (Losses)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	53,168	61,912	75,388	37,333
OCI, before reclassifications, net of tax	(10,158)	9,505	(24,655)	37,199
Amounts reclassified from AOCI, net of tax	(1,503)	(2,975)	(9,226)	(6,090)
Net OCI, current period	(11,661)	6,530	(33,881)	31,109
Ending balance	41,507	68,442	41,507	68,442
Non-credit Impairments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	0	(704)	(57)	(300)
OCI, before reclassifications, net of tax	0	0	0	(187)
Amounts reclassified from AOCI, net of tax	0	647	57	430
Net OCI, current period	0	647	57	243
Ending balance	0	(57)	0	(57)
Unrecognized Change in Defined Benefit Plan Liabilities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(96)	(78)	(104)	(78)
OCI, before reclassifications, net of tax	0	(22)	8	(22)
Amounts reclassified from AOCI, net of tax	96	0	96	0
Net OCI, current period	96	(22)	104	(22)
Ending balance	0	(100)	0	(100)
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	53,072	61,130	75,227	36,955
Ending balance	$ 41,507	$ 68,285	$ 41,507	$ 68,285

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent.

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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Amount after tax of reclassification adjustments of other comprehensive income (loss) attributable to parent.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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