Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net (loss) income	$ (1,705)	$ 6,785	$ 7,061
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	15,344	16,451	17,710
Provision for doubtful accounts	5,622	5,552	4,640
Noncash amortization of debt financing costs	1,251	840	1,059
Loss on early extinguishment of debt	0	0	591
Shared-based compensation expense	2,503	2,607	2,853
(Gain) loss on sale of assets	(586)	80	596
Deferred income taxes	7,992	(2,525)	8,157
Noncash (gain) loss on forward exchange contracts	(726)	603	151
Impairment of equipment held for sale	0	616	0
Change in other operating items:
Accounts receivable	(13,794)	25,501	166
Inventories	(25,104)	2,993	6,761
Prepaid expenses	(814)	(978)	(3,743)
Accounts payable	23,250	(4,263)	(3,642)
Accrued liabilities	(12,284)	(1,997)	8,211
Other operating activities, net	1,308	(2,900)	4,728
Net cash provided by operating activities	2,257	49,365	55,299
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment	(13,458)	(11,429)	(14,685)
Proceeds from disposal/sale of property, plant and equipment	2,682	37	108
Proceeds from corporate-owned life insurance policies	0	2,489	0
Other investing activities, net	0	0	71
Net cash used in investing activities	(10,776)	(8,903)	(14,506)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings of Term Loan Facility	175,000	0	0
Repayment of Term Loan principal	(2,188)	0	0
Surrender of common stock by employees	(1,361)	(714)	(417)
Redemption of Notes	(235,000)	0	(15,000)
Prepayment charge for redemption of 7.875% Notes	(1,543)	0	0
Prepayment of Term Loan Facility Discount	(3,500)	0	0
Payment of Debt Issuance Costs	(4,256)	0	0
Early payment fee on debt and other debt issuance costs	0	0	(591)
Net cash used in financing activities	(72,848)	(714)	(16,008)
EFFECT OF CURRENCY EXCHANGE RATE CHANGES ON CASH	3,451	(1,782)	(2,682)
NET (DECREASE) INCREASE IN CASH	(77,916)	37,966	22,103
CASH:
Beginning of period	130,160	92,194	70,091
End of period	52,244	130,160	92,194
SUPPLEMENTAL CASH FLOW INFORMATION:
Cash paid for interest	18,572	18,684	19,939
Cash paid for income taxes, net	3,276	2,495	1,545
Unpaid purchases of property and equipment included in accounts payable	$ 109	$ 488	$ 905