Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net (loss) income	$ 44,512	$ (1,705)	$ 6,785
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	15,418	15,344	16,451
Provision for doubtful accounts	7,607	5,622	5,552
Noncash amortization of debt financing costs	1,404	1,251	840
Shared-based compensation expense	3,137	2,503	2,607
Deferred income taxes	5,940	7,992	(2,525)
Noncash (gain) loss on forward exchange contracts	(1,468)	(726)	603
Impairment of equipment held for sale	0	0	616
Change in other operating items:
Accounts receivable	(35,674)	(13,794)	25,501
Inventories	4,836	(25,104)	2,993
Prepaid expenses	(5,685)	(814)	(978)
Accounts payable	1,451	23,250	(4,263)
Accrued liabilities	2,631	(12,284)	(1,997)
Other operating activities, net	(3,117)	722	(2,820)
Net cash provided by operating activities	40,992	2,257	49,365
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment	(14,150)	(13,458)	(11,429)
Proceeds from disposal/sale of property, plant and equipment	49	2,682	37
Proceeds from corporate-owned life insurance policies	0	0	2,489
Net cash used in investing activities	(14,101)	(10,776)	(8,903)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings of Revolving Credit Facility	80,500	0	0
Repayment of Revolving Credit Facility	(80,500)	0	0
Borrowings of Term Loan Facility	0	175,000	0
Repayment of Term Loan Facility principal	(4,375)	(2,188)	0
Surrender of common stock by employees	(1,131)	(1,361)	(714)
Redemption of Notes	0	(235,000)	0
Prepayment charge for redemption of 7.875% Notes	0	(1,543)	0
Payment of Term Loan Facility discount	0	(3,500)	0
Payment of debt issuance costs	0	(4,256)	0
Other financing activities, net	(329)	0	0
Net cash used in financing activities	(5,835)	(72,848)	(714)
EFFECT OF CURRENCY EXCHANGE RATE CHANGES ON CASH	(2,387)	3,451	(1,782)
NET INCREASE (DECREASE) IN CASH	18,669	(77,916)	37,966
CASH:
Beginning of period	52,244	130,160	92,194
End of period	70,913	52,244	130,160
SUPPLEMENTAL CASH FLOW INFORMATION:
Cash paid for interest	14,046	18,572	18,684
Cash paid for income taxes, net	3,143	3,276	2,495
Unpaid purchases of property and equipment included in accounts payable	$ 509	$ 109	$ 488