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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Cash flows from operating activities:      
Net income $ 5,301 $ 38,572 $ 3,630
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 26,747 29,735 31,926
Provision for credit losses 0 332 441
Deferred income taxes (1,560) (478) (1,779)
Shares issued for employee benefit plan 1,092 1,136 947
Employee and director stock-based compensation 9,969 9,122 8,845
Performance-based common stock warrants (686) 686 1,997
Impairment of long-term assets 3,338 134 1,506
Loss on sale of Argentina subsidiary, net of cash transferred 5,960 0 0
Accrued social insurance adjustment 0 (9,464) 0
Loss on sale of Ohio call center 0 712 0
Changes in operating assets and liabilities:      
Accounts receivable and contract assets 2,007 14,884 17,203
Inventories (14,985) 28,295 (1,914)
Prepaid expenses and other assets (630) (245) 4,648
Accounts payable and accrued liabilities 870 (33,543) 14,233
Accrued income taxes 2,860 (6,486) 3,574
Net cash provided by operating activities 40,283 73,392 85,257
Cash flows from investing activities:      
Acquisitions of property, plant and equipment (12,586) (16,862) (21,313)
Acquisitions of intangible assets (4,455) (6,372) (2,655)
Payment on sale of Ohio call center 0 (500) 0
Net cash used for investing activities (17,041) (23,734) (23,968)
Cash flows from financing activities:      
Borrowings under line of credit 112,000 75,000 72,500
Repayments on line of credit (76,000) (123,000) (106,000)
Proceeds from stock options exercised 1,638 2,805 448
Treasury stock purchased (59,664) (17,678) (1,928)
Contingent consideration payments in connection with business combinations 0 (3,091) (4,251)
Net cash used for financing activities (22,026) (65,964) (39,231)
Effect of foreign currency exchange rate changes on cash and cash equivalents 2,444 (843) (963)
Net increase (decrease) in cash and cash equivalents 3,660 (17,149) 21,095
Cash and cash equivalents at beginning of period 57,153 74,302 53,207
Cash and cash equivalents at end of period 60,813 57,153 74,302
Supplemental cash flow information:      
Income taxes paid 10,093 12,712 7,275
Interest paid $ 620 $ 1,610 $ 4,403