Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash Flows from Operating Activities:
Net income	$ 11,130	$ 9,853
Adjustments to reconcile net income to cash flows from operating activities:
Depreciation and amortization	3,718	3,813
Allowance for accounts receivable	2,350	2,637
Non-cash amortization of debt financing costs	342	350
Shared-based compensation expense	761	673
Deferred income taxes	2,625	2,304
Non-cash loss / (gain) on derivative contracts	737	(2,489)
Change in other operating items:
Accounts receivable	(26,356)	(34,884)
Inventories	(4,739)	5,261
Prepaid expenses	(3,780)	(2,065)
Accounts payable	9,548	(2,105)
Other operating activities, net	(2,307)	(3,363)
Net cash used in operating activities	(5,971)	(20,015)
Cash Flows from Investing Activities:
Purchases of property, plant and equipment	(5,580)	(1,716)
Proceeds from disposal/sale of property, plant and equipment	20	0
Net cash used in investing activities	(5,560)	(1,716)
Cash Flows from Financing Activities:
Borrowing of Revolving Credit Facility	0	36,500
Repayment of Revolving Credit Facility	0	(29,000)
Repayment of Term Loan	(5,244)	(1,094)
Other financing activities	(105)	0
Net cash (used in) provided by financing activities	(5,349)	6,406
Effect of Foreign Currency Exchange Rate Changes on Cash	315	989
Net Decrease in Cash	(16,565)	(14,336)
Cash:
Beginning of period	70,913	52,244
End of period	54,348	37,908
Supplemental Cash Flow Information:
Cash paid for interest	3,373	3,408
Cash paid for income taxes, net	2,593	808
Unpaid purchases of property and equipment included in accounts payable	$ 233	$ 49