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Investments (Cumulative Credit Loss Portion of Other Than Temporary Impairment Recognized in Operations) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Investments [Abstract]
Cumulative credit loss at beginning of period	$ (128,513)	$ (122,954)	$ (134,027)	$ (119,095)
Credit losses on securities for which OTTI has not previously been recognized	0	0	(4,536)	(47)
Additional credit losses on securities for which OTTI has previously been recognized	(222)	(1,686)	(1,270)	(5,498)
Accumulated losses on securities that were disposed of during the period	2,775	0	13,873	0
Cumulative credit loss at end of period	$ (125,960)	$ (124,640)	$ (125,960)	$ (124,640)

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This item represents an increase to the cumulative amount of credit losses recognized in earnings for an other than temporary impairment (OTTI) of a debt security held for which a previous OTTI was recognized and the investor does not intend to sell the debt security and it is not more likely than not that the investor will be required to sell the debt security before recovery of its amortized cost basis.

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This item represents an increase to the cumulative amount of credit losses recognized in earnings for an other than temporary impairment (OTTI) of a debt security held for which no such other than temporary impairment (OTTI) was previously recognized.

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The cumulative amount of credit losses recognized in earnings related to debt securities held for which a portion of an other than temporary impairment (OTTI) was recognized in other comprehensive income (a component of shareholders' equity).

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This item represents reductions in the cumulative amount of credit losses recognized in earnings for an other than temporary impairment (OTTI) of a debt security because of the sale of impaired securities during the period.

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