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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating activities      
Net earnings $ 23,645 $ 14,394 $ 6,408
Adjustments to reconcile net earnings to net cash provided by operating activities      
Impairment of goodwill and indefinite-lived intangibles 2,820 0 0
Depreciation and amortization 10,631 10,626 11,149
(Gain) loss on disposal of property and equipment (120) (195) (823)
Share-based compensation expense 1,799 1,499 37
Inventory write-offs for obsolescence 1,876 2,065 1,755
Deferred income taxes 1,011 1,890 301
Other 819 893 (2,044)
Net changes in operating assets and liabilities, net of acquisition      
Accounts receivable (7,757) (10,537) 1,322
Inventories (5,095) (4,307) (1,968)
Prepaid expenses and other current assets 588 (3,260) 955
Trade accounts payable (819) 2,009 237
Other current liabilities 5,981 7,652 (5,824)
Net cash provided by operating activities 35,379 22,729 11,505
Investing activities      
Capital expenditures (14,521) (6,960) (10,425)
Proceeds from sale of property and equipment 132 541 4,203
Purchase of business 0 0 (10,626)
Net cash used in investing activities (14,389) (6,419) (16,848)
Financing activities      
Principal payments on long-term debt (5,603) (2,628) (2,133)
Proceeds from revolving facility 22,000 41,000 25,000
Payments on revolving facility (19,000) (41,000) (20,000)
Distributions to noncontrolling interests (109) (75) (15)
Payments of employee taxes on certain share-based arrangements (801) (303) (85)
Net cash (used in) provided by financing activities (3,513) (3,006) 2,767
Effect of exchange rate changes on cash and cash equivalents (1,610) 2,536 (1,613)
Increase (decrease) in cash and cash equivalents 15,867 15,840 (4,189)
Cash and cash equivalents at beginning of year 74,292 58,452 62,641
Cash and cash equivalents at end of year 90,159 74,292 58,452
Supplemental disclosure of investing transactions:      
Capital expenditures purchased (13,239) (10,092) (10,425)
Supplemental disclosure of non-cash financing transactions:      
Conversion of exchangeable notes to common stock $ (2,794) $ (1,303) $ 0