Consolidated Statements of Shareholders' Equity (USD $) In Thousands, unless otherwise specified	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning Balance at Dec. 31, 2009	$ 179,202	$ 10,246	$ 116,396	$ 116,804	$ (64,244)
Stock-based compensation	3,267		3,267
Comprehensive income:
Net income	15,456			15,456
Other comprehensive loss	4,770				4,770
Comprehensive income	20,226
Issuance of common stock including excess tax benefits of $681, $47 and $16 for 2010, 2011 and 2012	1,470	59	1,411
Cash dividends ($0.72 per share)	(7,388)			(7,388)
Ending Balance at Dec. 31, 2010	196,777	10,305	121,074	124,872	(59,474)
Stock-based compensation	1,636		1,636
Comprehensive income:
Net income	21,309			21,309
Other comprehensive loss	(19,816)				(19,816)
Comprehensive income	1,493
Issuance of common stock including excess tax benefits of $681, $47 and $16 for 2010, 2011 and 2012	399	21	378
Cash dividends ($0.72 per share)	(7,433)			(7,433)
Ending Balance at Dec. 31, 2011	192,872	10,326	123,088	138,748	(79,290)
Stock-based compensation	1,058		1,058
Comprehensive income:
Net income	8,355			8,355
Other comprehensive loss	(3,085)				(3,085)
Comprehensive income	5,270
Issuance of common stock including excess tax benefits of $681, $47 and $16 for 2010, 2011 and 2012	338	20	318
Cash dividends ($0.72 per share)	(7,445)			(7,445)
Ending Balance at Dec. 31, 2012	$ 192,093	$ 10,346	$ 124,464	$ 139,658	$ (82,375)