CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash provided by (used for) operating activities:
Net income (loss)	$ 5,846	$ (1,005)
Adjustments to reconcile net income (loss) to net cash provided by (used for) operating activities:
Depreciation and amortization	7,498	8,019
Provision for bad debts	237	3
Deferred income taxes	835	2,966
Shares issued for employee benefit plan	527	347
Employee and director stock-based compensation	2,303	1,918
Performance-based common stock warrants	184	434
Loss on sale of Ohio call center	712	0
Changes in operating assets and liabilities:
Accounts receivable and contract assets	2,060	(14,056)
Inventories	1,609	(3,982)
Prepaid expenses and other assets	118	735
Accounts payable and accrued liabilities	(28,969)	3,017
Accrued income taxes	(1,307)	(2,943)
Net cash provided by (used for) operating activities	(8,347)	(4,547)
Cash provided by (used for) investing activities:
Acquisitions of property, plant and equipment	(1,986)	(2,800)
Acquisitions of intangible assets	(1,270)	(653)
Payment on sale of Ohio call center	(500)	0
Net cash provided by (used for) investing activities	(3,756)	(3,453)
Cash provided by (used for) financing activities:
Borrowings under line of credit	25,000	25,000
Repayments on line of credit	(15,000)	(20,000)
Treasury stock purchased	(6,291)	(1,215)
Contingent consideration payments in connection with business combinations	(3,091)	(4,251)
Net cash provided by (used for) financing activities	618	(466)
Effect of exchange rate changes on cash and cash equivalents	(3,890)	154
Net increase (decrease) in cash and cash equivalents	(15,375)	(8,312)
Cash and cash equivalents at beginning of period	74,302	53,207
Cash and cash equivalents at end of period	58,927	44,895
Supplemental cash flow information:
Income taxes paid	1,384	1,942
Interest paid	$ 637	$ 1,186