Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities:
Net income	$ 21,712	$ 3,302
Adjustments to reconcile net income to net cash provided by operations:
Depreciation and amortization	34,346	28,998
Stock-based compensation expense	8,497	8,458
Provision for deferred income taxes	(2,149)	(3,489)
Net provision for doubtful accounts	2,708	1,386
Gain on sale of assets	(552)	(4,896)
Amortization of original issue discount and debt issuance costs	4,075	4,068
Change in assets and liabilities:
Increase in receivables	(16,531)	(73,512)
Increase in inventories	(34,829)	(17,348)
Increase in other assets	(1,476)	(1,621)
Increase in accounts payable	7,106	17,996
Increase (decrease) in accrued liabilities and other	(2,791)	52,421
Net cash provided by operating activities	20,116	15,763
Cash flows from investing activities:
Capital expenditures	(32,814)	(21,888)
Refund of proceeds from sale of a business	(13,974)	0
Proceeds from sale of property, plant and equipment	1,477	2,233
Business acquisitions, net of cash acquired	(249)	0
Net cash used in investing activities	(45,560)	(19,655)
Cash flows from financing activities:
Borrowings on lines of credit	275,801	84,900
Payments on lines of credit	(254,116)	(21,400)
Debt issuance costs	(149)	(342)
Proceeds from employee stock plans	3,813	2,107
Purchases of treasury stock	(3,811)	(2,761)
Other financing activities	2,140	1,487
Net cash provided by financing activities	23,678	63,991
Effect of exchange rate changes on cash	(3,798)	2,371
Net increase (decrease) in cash, cash equivalents, and restricted cash	(5,564)	62,470
Cash, cash equivalents, and restricted cash at beginning of period	65,460	95,299
Cash, cash equivalents, and restricted cash at end of period	$ 59,896	$ 157,769