UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY AND COMPREHENSIVE INCOME (USD $) In Thousands, except Share data	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Balance at Dec. 31, 2009	$ 17,890	$ 160,230	$ (2,448)	$ 175,672
Balance (in shares) at Dec. 31, 2009	23,681
Net income	0	18,075	0	18,075
Reclassification adjustment for unrealized loss from pension plans included in net income, net of tax	0	0	2,596	2,596
Net unrealized gain from pension plans, net of tax	0	0	(148)	(148)
Total comprehensive income				20,523
Dividends declared ($0.33 per share)	0	(7,833)	0	(7,833)
Dividends reinvested in common stock	520	0	0	520
Dividends reinvested in common stock (in shares)	29
Stock-based compensation	792	0	0	792
Common stock issued through exercise of incentive stock options	561	0	0	561
Common stock issued through exercise of incentive stock options (in shares)	57
Net excess tax benefit from stock options exercised	70	0	0	70
Balance at Dec. 31, 2010	19,833	170,472	0	190,305
Balance (in shares) at Dec. 31, 2010	23,767
Net income	0	6,019	0	6,019
Total comprehensive income				6,019
Stock-based compensation	902	0	0	902
Common stock issued for share awards	0	0	0	0
Common stock issued for share awards (in shares)	19
Common stock repurchased	(92)	0	0	(92)
Common stock issued	8	0	0	8
Common stock repurchased (in shares)	(5)
Balance at Jun. 30, 2011	$ 20,651	$ 176,491	$ 0	$ 197,142
Balance (in shares) at Jun. 30, 2011	23,781