Consolidated Statements of Shareholders' Equity (USD $) In Thousands, unless otherwise specified	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]
Beginning Balance at Dec. 31, 2011	$ 192,872	$ 10,326	$ 123,088	$ 138,748	$ (79,290)
Stock-based compensation	1,058		1,058
Comprehensive income (loss):
Net income (loss)	8,355			8,355
Other comprehensive income	(3,085)				(3,085)
Comprehensive (loss) income	5,270
Issuance of common stock including excess tax benefits of $16, $5 and $60 for 2012, 2013 and 2014	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)
Stock-based compensation	996		996
Comprehensive income (loss):
Net income (loss)	12,437			12,437
Other comprehensive income	36,510				36,510
Comprehensive (loss) income	48,947
Issuance of common stock including excess tax benefits of $16, $5 and $60 for 2012, 2013 and 2014	419	27	392
Cash dividends ($0.72 per share)	(7,460)			(7,460)
Ending Balance at Dec. 31, 2013	234,995	10,373	125,852	144,635	(45,865)
Stock-based compensation	835		835
Comprehensive income (loss):
Net income (loss)	(1,187)			(1,187)
Other comprehensive income	(22,888)				(22,888)
Comprehensive (loss) income	(24,075)
Issuance of common stock including excess tax benefits of $16, $5 and $60 for 2012, 2013 and 2014	892	53	839
Cash dividends ($0.72 per share)	(7,499)			(7,499)
Ending Balance at Dec. 31, 2014	$ 205,148	$ 10,426	$ 127,526	$ 135,949	$ (68,753)