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Shareholders' Equity (AOCI Reclassification) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Reclassifications from AOCI to Net income:
Deferred tax expense (benefit) included in OCI	$ 1,481	$ 12,260
Tax rate used to compute the tax effect of amounts reclassified out of OCI	35.00%		35.00%
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassifications from AOCI to Net income:
Reclassification amount, before tax effect	$ 1,616	(7,999)
Tax effect (at 35%)	(566)	2,800
Net reclassification adjustments	1,050	(5,199)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Realized investment gains (losses) [Member]
Reclassifications from AOCI to Net income:
Reclassification amount, before tax effect	1,616	(5,241)
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	$ 0	$ (2,758)

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

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

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