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Shareholders' Equity (AOCI Reclassification) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Reclassifications from AOCI to Net income:
Deferred tax expense (benefit) included in OCI	$ 2,983	$ 7,541	$ 4,464	$ 19,801
Tax rate used to compute the tax effect of amounts reclassified out of OCI	35.00%	35.00%	35.00%	35.00%
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassifications from AOCI to Net income:
Reclassification amount, before tax effect	$ (656)	$ 1,271	$ 960	$ (6,722)
Tax effect (at 35%)	230	(445)	(336)	2,353
Net reclassification adjustments	(426)	826	624	(4,369)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Realized investment gains (losses) [Member]
Reclassifications from AOCI to Net income:
Reclassification amount, before tax effect	(653)	2,024	963	(4,443)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Non-credit impairment losses reclassified to earnings, due to sale of securities or reclassification as a credit loss [Member]
Reclassifications from AOCI to Net income:
Reclassification amount, before tax effect	$ (3)	$ (753)	$ (3)	$ (2,279)

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of tax expense (benefit) allocated to other comprehensive income (loss).

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Amount before tax of reclassification adjustments of other comprehensive income (loss).

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

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