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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 (loss) $ 3,893 $ (99,466) $ 6,080
Adjustments to reconcile net income (loss) to net cash provided by operating activities      
Depreciation and amortization 34,921 35,705 38,533
Deferred income taxes 87 (13,409) (3,599)
Share-based compensation expense 5,421 5,851 5,766
Impairment charges 0 106,062 0
Bad debt provision for troubled customers, net of recoveries 0 0 3,038
Foreign currency (gain) loss 417 3,010 (535)
Fair value adjustments to contingent consideration 949 337 511
Other 119 2,398 1,804
Changes in operating assets and liabilities, net of effect of acquisitions and dispositions      
Accounts receivable (3,979) 27,313 8,298
Inventories 278 84 (302)
Prepaid expenses and other assets 943 (1,288) 3,289
Accounts payable (1,139) (1,020) 1,138
Accrued expenses and other liabilities 2,268 1,841 (5,042)
Income taxes payable (1,917) 384 131
Net cash provided by operating activities 42,261 67,802 59,110
Cash flows from investing activities      
Purchase of property, plant and equipment (18,161) (15,396) (22,047)
Purchase of intangible assets (1,115) (376) (873)
Acquisition of businesses, net of cash acquired (440) 0 (4,228)
Proceeds from sale of equipment 1,165 803 1,868
Net cash used in investing activities (18,551) (14,969) (25,280)
Cash flows from financing activities      
Repayment of finance lease obligations (4,060) (4,095) (4,545)
Proceeds from borrowings of long-term debt 0 2,284 983
Repayment of long-term debt (16,262) (5,976) (6,857)
Proceeds from revolver 89,000 35,750 32,000
Repayments of revolver (89,065) (68,050) (61,700)
Payments of debt issuance costs (550) (1,497) 0
Payment of contingent consideration for business acquisitions (938) (2,091) (852)
Taxes paid related to net share settlement of share-based awards (1,370) (494) (3,198)
Proceeds from the exercise of stock options 0 0 32
Net cash used in financing activities (23,245) (44,169) (44,137)
Effect of exchange rate changes on cash and cash equivalents (2,115) 2,080 (221)
Net change in cash and cash equivalents (1,650) 10,744 (10,528)
Cash and cash equivalents:      
Beginning of period 25,760 15,016 25,544
End of period 24,110 25,760 15,016
Supplemental disclosure of cash paid      
Interest, net 10,078 12,465 14,158
Income taxes, net 4,707 (543) 6,096
Noncash investing and financing      
Equipment acquired through finance lease obligations $ 2,923 $ 2,849 $ 9,502