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Investments (Details Textual) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2012 Positions	Dec. 31, 2011	Dec. 31, 2010
Investments (Textual) [Abstract]
Gross unrealized loss		$ 9,890	$ 33,053
Fair value of issued securities		5,962,232	5,421,832
Investments (Additional Textual) [Abstract]
Net realized investment gains		27,298	37,663	23,769
Gross gains realized on security sales		39,941	39,709	51,220
Other-than-temporary impairment write-downs on securities		0	72	6,796
Realized losses on securities	15,152	12,643	1,974	20,655
Number of positions with a gross unrealized loss, Fair Value		199
Fair value of positions with a gross unrealized loss as a percentage of total fixed maturities and equity securities fair value		5.30%	9.30%
Fixed maturities and equity securities with investment grade rating, percent of gross unrealized loss		74.00%
Number of positions with a gross unrealized loss, More Than 12 Months		43
Unrealized loss on Securities in an unrealized loss position for more than 12 months		5,532
Investments which exceeded 10% of entities total shareholders' equity		0.00%
Fair value of securities on deposit with government agencies		18,565	18,779
Fixed Maturity Securities and Equity Securities [Member]
Investments (Textual) [Abstract]
Gross unrealized loss		11,180
Mortgage-backed securities [Member]
Investments (Textual) [Abstract]
Largest unrealized loss on a single security		2,505	12,491
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member]
Investments (Textual) [Abstract]
Fair value of issued securities		375,111	547,521
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member]
Investments (Textual) [Abstract]
Fair value of issued securities		418,174	374,361
Government National Mortgage Association Certificates and Obligations (GNMA) [Member]
Investments (Textual) [Abstract]
Fair value of issued securities		$ 136,998	$ 124,515

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