Statements of Consolidated Shareholders' Equity - USD ($) $ in Thousands	Total	Common Shares [Member]	Common Shares Issued to Rabbi Trust [Member]	Deferred Compensation Liability [Member]	Paid In Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Cumulative Translation Adjustment [Member]	Unrecognized Pension Benefit Cost [Member]
Beginning Balance at Dec. 31, 2012	$ 241,069	$ 12,135	$ (6,522)	$ 6,522	$ 16,355	$ 264,115	$ (37,872)	$ (7,340)	$ (6,324)
Net income	20,587					20,587
Foreign currency translation adjustment	(8,457)							(8,457)
Recognized net actuarial loss, net of tax provision of $187, $6 and $219 for 2013, 2014 and 2015 respectively	306								306
Gain (loss) on unfunded pension obligations, net of tax (benefit) provision of $2,506, $3,115, $245 for 2013, 2014 and 2015 respectively	4,113								4,113
Comprehensive income (loss)	16,549
Share-based compensation	2,957				3,057	(100)
Excess tax benefits from share-based awards	357				357
Purchase of 89,807, 40,145 and 198,589 common shares for 2013, 2014 and 2015 respectively	(6,911)						(6,911)
Issuance of 34,575, 3,531 and 1,899 common shares for 2013, 2014 and 2015 respectively	1,519	69			1,450
Restricted shares awards of 68,369, 42,678, 20,614 for 2013, 2014 and 2015 respectively	0	137			(137)
Common shares issued to rabbi trust of 69,120, 43,592 and 7,113 for 2012, 2013 and 2014 respectively	0		(2,784)	2,784
Cash dividends declared - $.60, $.80 and $.80 per share for 2013, 2014 and 2015 respectively	(3,210)					(3,210)
Ending Balance at Dec. 31, 2013	252,330	12,341	(9,306)	9,306	21,082	281,392	(44,783)	(15,797)	(1,905)
Net income	12,861					12,861
Foreign currency translation adjustment	(12,330)							(12,330)	0
Recognized net actuarial loss, net of tax provision of $187, $6 and $219 for 2013, 2014 and 2015 respectively	10							0	10
Gain (loss) on unfunded pension obligations, net of tax (benefit) provision of $2,506, $3,115, $245 for 2013, 2014 and 2015 respectively	(5,112)							0	(5,112)
Comprehensive income (loss)	(4,571)
Share-based compensation	1,436				1,542	(106)
Excess tax benefits from share-based awards	97				97
Purchase of 89,807, 40,145 and 198,589 common shares for 2013, 2014 and 2015 respectively	(2,235)						(2,235)
Issuance of 34,575, 3,531 and 1,899 common shares for 2013, 2014 and 2015 respectively	166	7			159
Restricted shares awards of 68,369, 42,678, 20,614 for 2013, 2014 and 2015 respectively	0	85			(85)
Common shares issued to rabbi trust of 69,120, 43,592 and 7,113 for 2012, 2013 and 2014 respectively	0		(2,484)	2,484
Cash dividends declared - $.60, $.80 and $.80 per share for 2013, 2014 and 2015 respectively	(4,298)					(4,298)
Ending Balance at Dec. 31, 2014	242,925	12,433	(11,790)	11,790	22,795	289,849	(47,018)	(28,127)	(7,007)
Net income	6,675					6,675
Foreign currency translation adjustment	(19,789)							(19,789)	0
Recognized net actuarial loss, net of tax provision of $187, $6 and $219 for 2013, 2014 and 2015 respectively	364							0	364
Gain (loss) on unfunded pension obligations, net of tax (benefit) provision of $2,506, $3,115, $245 for 2013, 2014 and 2015 respectively	408							0	408
Comprehensive income (loss)	(12,342)
Share-based compensation	295				248	47
Excess tax benefits from share-based awards	(20)				(20)
Purchase of 89,807, 40,145 and 198,589 common shares for 2013, 2014 and 2015 respectively	(7,552)						(7,552)
Issuance of 34,575, 3,531 and 1,899 common shares for 2013, 2014 and 2015 respectively	80	4			76
Restricted shares awards of 68,369, 42,678, 20,614 for 2013, 2014 and 2015 respectively	0	41			(41)
Common shares issued to rabbi trust of 69,120, 43,592 and 7,113 for 2012, 2013 and 2014 respectively	0		(262)	262
Cash dividends declared - $.60, $.80 and $.80 per share for 2013, 2014 and 2015 respectively	(4,402)				(142)	(4,260)
Ending Balance at Dec. 31, 2015	$ 218,984	$ 12,478	$ (12,052)	$ 12,052	$ 22,916	$ 292,311	$ (54,570)	$ (47,916)	$ (6,235)