CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash provided by (used for) operating activities:
Net income (loss)	$ (1,005)	$ (587)
Adjustments to reconcile net income (loss) to net cash provided by (used for) operating activities:
Depreciation and amortization	8,019	8,243
Provision for doubtful accounts	3	4
Provision for inventory write-downs	2,537	756
Deferred income taxes	2,966	913
Shares issued for employee benefit plan	347	336
Employee and director stock-based compensation	1,918	2,204
Performance-based common stock warrants	434	471
Changes in operating assets and liabilities:
Accounts receivable and contract assets	(14,056)	(266)
Inventories	(6,519)	1,372
Prepaid expenses and other assets	735	(455)
Accounts payable and accrued liabilities	3,017	(21,160)
Accrued income taxes	(2,943)	(3,774)
Net cash provided by (used for) operating activities	(4,547)	(11,943)
Cash provided by (used for) investing activities:
Acquisitions of property, plant and equipment	(2,800)	(9,314)
Acquisitions of intangible assets	(653)	(571)
Net cash provided by (used for) investing activities	(3,453)	(9,885)
Cash provided by (used for) financing activities:
Borrowings under line of credit	25,000	13,000
Repayments on line of credit	(20,000)	(10,000)
Proceeds from stock options exercised	0	439
Treasury stock purchased	(1,215)	(615)
Contingent consideration payments in connection with business combinations	(4,251)	(3,858)
Net cash provided by (used for) financing activities	(466)	(1,034)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	154	832
Net increase (decrease) in cash, cash equivalents and restricted cash	(8,312)	(22,030)
Cash, cash equivalents and restricted cash at beginning of year	53,207	67,339
Cash, cash equivalents and restricted cash at end of period	44,895	45,309
Supplemental cash flow information:
Income taxes paid	1,942	2,893
Interest paid	$ 1,186	$ 1,164