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Shareholders' Equity (Reclassifications from AOCI to Net Income)(Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reclassification adjustments related to available-for-sale securities
Tax effect (at 35%)									$ (12,658)	$ (65,440)	$ (99,636)
Net income	$ 34,948	$ 10,276	$ 33,158	$ 37,814	$ 65,114	$ 34,778	$ 49,942	$ 46,731	116,197	196,565	297,523
Deferred tax expense (benefit) included in OCI									(18,370)	(785)	(46,157)
Reclassifications from accumulated other comprehensive income to net income, available for sale securities [Member]
Reclassification adjustments related to available-for-sale securities
Tax effect (at 35%)									2,364	(1,161)	(3,981)
Net income									(4,390)	2,156	7,394
Reclassifications from accumulated other comprehensive income to net income, available for sale securities [Member] | Realized investment gains (losses) [Member]
Reclassification adjustments related to available-for-sale securities
Reclassifications from AOCI to net income, available-for-sale securities									(4,475)	3,317	11,722
Reclassifications from accumulated other comprehensive income to net income, available for sale securities [Member] | Non-credit impairment losses reclassified to earnings, due to sale of securities or reclassification as a credit loss [Member]
Reclassification adjustments related to available-for-sale securities
Reclassifications from AOCI to net income, available-for-sale securities									$ (2,279)	$ 0	$ (347)

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