CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash provided by (used for) operating activities:
Net income (loss)	$ 26,414	$ (3,397)
Adjustments to reconcile net income (loss) to net cash provided by (used for) operating activities:
Depreciation and amortization	22,857	23,734
Provision for bad debts	271	275
Deferred income taxes	503	2,273
Shares issued for employee benefit plan	959	876
Employee and director stock-based compensation	6,854	6,718
Performance-based common stock warrants	525	1,381
Impairment of long-term assets	57	0
Accrued social insurance adjustment	(9,464)	0
Loss on sale of Ohio call center	712	0
Changes in operating assets and liabilities:
Accounts receivable and contract assets	11,556	(11,117)
Inventories	30,466	4,403
Prepaid expenses and other assets	601	5,507
Accounts payable and accrued liabilities	(50,507)	11,686
Accrued income taxes	2,023	(2,418)
Net cash provided by (used for) operating activities	43,827	39,921
Cash provided by (used for) investing activities:
Acquisitions of property, plant and equipment	(10,864)	(15,854)
Acquisitions of intangible assets	(5,254)	(1,505)
Payment on sale of Ohio call center	(500)	0
Net cash provided by (used for) investing activities	(16,618)	(17,359)
Cash provided by (used for) financing activities:
Borrowings under line of credit	70,000	57,500
Repayments on line of credit	(88,000)	(71,000)
Proceeds from stock options exercised	0	411
Treasury stock purchased	(9,822)	(1,741)
Contingent consideration payments in connection with business combinations	(3,091)	(4,251)
Net cash provided by (used for) financing activities	(30,913)	(19,081)
Effect of exchange rate changes on cash and cash equivalents	(3,452)	(1,959)
Net increase (decrease) in cash and cash equivalents	(7,156)	1,522
Cash and cash equivalents at beginning of period	74,302	53,207
Cash and cash equivalents at end of period	67,146	54,729
Supplemental cash flow information:
Income taxes paid	3,242	5,608
Interest paid	$ 1,404	$ 3,479