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Consolidated Statements Of Changes In Shareholders' Equity (USD $) In Thousands	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss), Net Of Taxes [Member]	Treasury Stock, At Cost [Member]	Total
Beginning balance at Dec. 31, 2009	$ 61	$ 358,081	$ 758,343	$ 10,723	$ (407,663)
Conversion of common stock units, 2011, 15,715 shares; 2010, 160,876 shares
Conversion of restricted stock units, 2011, 170,876 shares; 2010, 46,576 shares
Options exercised and conversion of common stock units and restricted stock units		3,194
Share-based compensation expense		743
Net income			45,584			45,584
Cash dividends, 2011, $0.22 per share; 2010, $0.16 per share			(6,519)
Change in net unrealized gains and losses on fixed maturities and equity securities				111,013		111,013
Change in net funded status of pension and other postretirement benefit obligations
Ending balance at Jun. 30, 2010	61	362,018	797,408	121,736	(407,663)	873,560
Beginning balance at Dec. 31, 2010	61	367,448	823,579	96,582	(407,663)	880,007
Options exercised, 2011, 136,290 shares; 2010, 6,200 shares	1
Conversion of common stock units, 2011, 15,715 shares; 2010, 160,876 shares
Conversion of restricted stock units, 2011, 170,876 shares; 2010, 46,576 shares
Options exercised and conversion of common stock units and restricted stock units		4,247
Share-based compensation expense		819
Net income			14,124			14,124
Cash dividends, 2011, $0.22 per share; 2010, $0.16 per share			(9,094)
Change in net unrealized gains and losses on fixed maturities and equity securities				43,160		43,160
Change in net funded status of pension and other postretirement benefit obligations
Acquisition of shares, 2011, 60,126 shares; 2010, 0 shares					(1,007)
Ending balance at Jun. 30, 2011	$ 62	$ 372,514	$ 828,609	$ 139,742	$ (408,670)	$ 932,257

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