Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 7,061	$ 7,631	$ (12,451)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	17,710	18,247	20,583
Provision for doubtful accounts	4,640	5,225	2,520
Noncash amortization of debt financing costs	1,059	891	1,132
Pension plan contributions	(2,958)	(2,965)	(3,103)
Loss on early extinguishment of debt	591	0	0
Shared-based compensation expense	2,853	2,741	5,278
Loss on sale of assets	596	1,098	142
Deferred income tax benefit	8,157	3,277	(398)
Noncash loss on forward exchange contracts	151	483	264
Change in other operating items:
Accounts receivable	166	(27,875)	(6,934)
Inventories	6,761	(5,370)	8,553
Prepaid expenses	(3,743)	2,267	(1,250)
Accounts payable	(3,642)	3,065	8,982
Accrued liabilities	8,211	1,022	2,475
Other operating activities, net	7,686	(218)	(6,639)
Net cash provided by operating activities	55,299	9,519	19,154
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment	(14,685)	(13,704)	(12,626)
Proceeds from disposal/sale of property, plant and equipment	108	689	322
Other investing activities, net	71	726	(645)
Net cash used in investing activities	(14,506)	(12,289)	(12,949)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from borrowings against life insurance policies	0	1,041	0
Proceeds from issuance of common stock under equity incentive plans	0	0	38
Surrender of common stock by employees	(417)	(527)	(831)
Redemption of Notes	(15,000)	0	0
Early payment fee on debt and other debt issuance costs	(591)	0	(144)
Net cash (used in) provided by financing activities	(16,008)	514	(937)
EFFECT OF CURRENCY EXCHANGE RATE CHANGES ON CASH	(2,682)	(348)	(942)
NET INCREASE (DECREASE) IN CASH	22,103	(2,604)	4,326
CASH:
Beginning of period	70,091	72,695	68,369
End of period	92,194	70,091	72,695
SUPPLEMENTAL CASH FLOW INFORMATION:
Cash paid for interest	19,939	19,831	19,958
Cash paid for income taxes, net	1,545	1,387	2,344
Unpaid purchases of property and equipment included in accounts payable	$ 905	$ 864	$ 1,040