Consolidated Statements of Shareholders' Equity Statement (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Common stock	$ 128	$ 125	$ 128	$ 125
Retained earnings	87,777	90,937	87,777	90,937
Treasury stock	(46)	(806)	(46)	(806)
Accumulated other comprehensive loss	(38,801)	(1,419)	(38,801)	(1,419)	(25,509)	(22,133)
Total stockholders' equity	169,596	203,788	169,596	203,788
Net (loss) income	4,542	6,143	(2,140)	9,927	17,855
Other comprehensive income (loss), net of tax			(37,382)	24,090	(3,376)
Common Stock [Member]
Common stock	128	125	128	125	125	125
Common shares issued			3
Additional Paid-in Capital [Member]
Additional paid-in capital	120,538	114,951	120,538	114,951	114,072	114,369
Shares issued pursuant to long-term incentive plan			101	(530)	(843)
Shares exercised pursuant to long-term incentive plan			18
Shares forfeited pursuant to long-term incentive plan			(39)
Common shares issued			4,941	838
Amortization (long-term incentive plan)			414	621	662
Net issuance of treasury stock			152	(50)	(116)
Retained Earnings [Member]
Retained earnings	87,777	90,937	87,777	90,937	81,961	65,041
Net (loss) income			(2,140)	9,927	17,855
Dividends declared			(1,020)	(951)	(935)
Treasury Stock [Member]
Treasury stock	(46)	(806)	(46)	(806)	(9,442)	(10,379)
Shares issued pursuant to long-term incentive plan			220	(530)	(843)
Shares forfeited pursuant to long-term incentive plan			(46)
Common shares issued			586	8,040
Net issuance of treasury stock				66	94
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated other comprehensive loss	(38,801)	(1,419)	(38,801)	(1,419)	(25,509)	(22,133)
Other comprehensive income (loss), net of tax			(37,382)	24,090	(3,376)
Stockholders' Equity, Total [Member]
Total stockholders' equity	169,596	203,788	169,596	203,788	161,207	147,023
Net (loss) income			(2,140)	9,927	17,855
Other comprehensive income (loss), net of tax			(37,382)	24,090	(3,376)
Dividends declared			(1,020)	(951)	(935)
Shares issued pursuant to long-term incentive plan			321	0	0
Shares exercised pursuant to long-term incentive plan			18
Shares forfeited pursuant to long-term incentive plan			(85)
Common shares issued			5,530	8,878
Amortization (long-term incentive plan)			414	621	662
Net issuance of treasury stock			$ 152	$ 16	$ (22)