Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 2,918	$ 602
Adjustments to reconcile net income to cash provided (used) by operating activities:
Deferred income taxes	(1,450)	(432)
Depreciation	5,882	6,527
Amortization	3,560	3,454
Equity in loss of nonconsolidated investments	3	55
Loss on sales and disposals of property, plant, and equipment	394	122
Stock-based compensation	1,904	725
Change in operating assets and liabilities
Accounts receivable	(20,060)	(9,951)
Inventories	(4,538)	(487)
Other current assets	(2,228)	(1,439)
Prepaid income tax	(1,823)	12,867
Other noncurrent assets	460	474
Accounts payable	21,574	19,534
Deferred revenue	2,110	(1,839)
Accrued payroll and employee benefits	(1,831)	878
Other current liabilities	1,145	(1,167)
Other long-term liabilities	(118)	(2)
Net cash provided by operating activities	7,902	29,921
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from the sale of property, plant, and equipment	2,086	143
Capital expenditures on property, plant, and equipment	(1,816)	(4,597)
Net cash provided by (used in) investing activities	270	(4,454)
CASH FLOWS FROM FINANCING ACTIVITIES:
Repayments of debt	(99,925)	(82,553)
Proceeds from debt	68,995	60,972
Treasury stock acquisitions	(310)	(97)
Net cash used by financing activities	(31,240)	(21,678)
Effect of exchange rate changes on cash and cash equivalents	(1,339)	1,305
Net (decrease) increase in cash and cash equivalents	(24,407)	5,094
Cash and cash equivalents at beginning of period	37,678	30,363
Cash and cash equivalents at end of period	13,271	35,457
Supplemental disclosure of cash flow information:
Interest paid	3,347	3,896
Income taxes paid (received)	$ 3,304	$ (11,480)