Condensed Consolidated Statements of Stockholders' Equity (Unaudited) (USD $) In Thousands, except Share data		Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Deferred Compensation	Treasury Stock
Beginning balance at Dec. 31, 2009		$ 209,781	$ 4,572	$ 144,502	$ 63,231	$ (2,524)	$ 739	$ (739)
Beginning balance, shares at Dec. 31, 2009	[1]		9,394,314
Net Income		26,056			26,056
Employee Benefit Plans, net of tax:
Amortization of prior service costs	[2]	8				8
Net Loss	[3]	(844)				(844)
Total comprehensive income		25,220
Dividend Reinvestment Plan, shares			53,806
Dividend Reinvestment Plan		1,725	26	1,699
Retirement Savings Plan, shares			27,795
Retirement Savings Plan		903	14	889
Conversion of debentures, shares			11,865
Conversion of debentures		202	6	196
Share based compensation, shares	[4][5]		36,415
Share based compensation	[4][5]	637	17	620
Tax benefit on share based compensation		253		253
Deferred Compensation Plan							38	(38)
Purchase of treasury stock, shares			(1,144)
Purchase of treasury stock		(38)						(38)
Sale and distribution of treasury stock, shares			1,144
Sale and distribution of treasury stock		38						38
Dividends on share-based compensation		(104)			(104)
Cash dividends	[6]	(12,378)			(12,378)
Ending balance at Dec. 31, 2010		226,239	4,635	148,159	76,805	(3,360)	777	(777)
Ending balance, shares at Dec. 31, 2010	[1]		9,524,195
Net Income		19,664			19,664
Employee Benefit Plans, net of tax:
Amortization of prior service costs	[2]	6				6
Net Loss	[3]	537				537
Total comprehensive income		20,207
Dividend Reinvestment Plan		(16)		(16)
Retirement Savings Plan, shares			2,002
Retirement Savings Plan		80	1	79
Conversion of debentures, shares			8,039
Conversion of debentures		136	4	132
Share based compensation, shares	[4][5]		30,430
Share based compensation	[4][5]	752	15	737
Deferred Compensation Plan							30	(30)
Purchase of treasury stock, shares			(731)
Purchase of treasury stock		(30)						(30)
Sale and distribution of treasury stock, shares			731
Sale and distribution of treasury stock		30						30
Dividends on share-based compensation		(100)			(100)
Cash dividends	[6]	(9,750)			(9,750)
Ending balance at Sep. 30, 2011		$ 237,548	$ 4,655	$ 149,091	$ 86,619	$ (2,817)	$ 807	$ (807)
Ending balance, shares at Sep. 30, 2011	[1]		9,564,666

[1] Includes 30,335 and 29,596 shares at September 30, 2011 and December 31, 2010, respectively, held in a Rabbi Trust established by the Company relating to the Deferred Compensation Plan.

[2] Tax expense recognized on the prior service cost component of employees benefit plans for the periods ended September 30, 2011 and December 31, 2010 were approximately $4 and $5, respectively.

[3] Tax expense (benefit) recognized on the net gain (loss) component of employees benefit plans for the periods ended September 30, 2011 and December 31, 2010, were $359 and ($541), respectively.

[4] Includes amounts for shares issued for Directors' compensation.

[5] The shares issued under the Performance Incentive Plan ("PIP") are net of shares withheld for employee taxes. For the periods ended September 30, 2011 and December 31, 2010 the Company withheld 12,324 and 17,695, respectively, shares for taxes.

[6] Cash dividends declared per share for the periods ended September 30, 2011 and December 31, 2010 were $1.02 and $1.305, respectively.