CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 10,545	$ 10,958
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	20,466	21,400
Loss (gain) on sales and/or abandonment of property and equipment	94	(28)
Write-off of certain intangible assets and other long-term assets	1,672
Amortization of right-of-use operating lease assets	2,584	3,070
Fair value adjustments to contingent consideration	2,600	402
Amortization of deferred credits	(27)	(27)
Amortization of long-term debt issuance costs	151	151
Stock-based compensation expense	4,642	3,595
Changes in operating assets and liabilities, net of acquisitions and divestitures:
Trade receivables	(3,851)	(5,284)
Other receivables	5,854	(597)
Inventories	(9,177)	(3,396)
Prepaid expenses and other current assets	(1,307)	(1,071)
Income tax refund receivables	196	199
Other assets	833	80
Trade payables	2,670	4,237
Accrued expenses	(23,508)	5,393
Income taxes payable	1,147	(174)
Deferred compensation payable	(1,307)	(581)
Operating lease liabilities	(2,841)	(3,151)
Other long-term obligations	574	56
Total adjustments	1,465	24,274
Net cash, cash equivalents, and restricted cash provided by operating activities	12,010	35,232
Capital expenditures for:
Property and equipment	(9,526)	(6,171)
Intangible assets	(342)	(692)
Proceeds from the sale of property and equipment		873
Cash paid in acquisitions, net of cash acquired		(358)
Net cash, cash equivalents, and restricted cash used in investing activities	(9,868)	(6,348)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common stock	1,641	5,520
Proceeds from issuance of long-term debt	80,524	9,694
Payments on long-term debt	(70,899)	(40,569)
Contingent payments related to acquisitions	(24,491)	(403)
Payment of taxes related to an exchange of common stock	(1,015)	(488)
Net cash, cash equivalents, and restricted cash used in financing activities	(14,240)	(26,246)
Effect of exchange rates on cash, cash equivalents, and restricted cash	111	(1,035)
Net increase (decrease) in cash, cash equivalents and restricted cash	(11,987)	1,603
CASH, CASH EQUIVALENTS AND RESTRICTED CASH:
Beginning of period	67,750	56,916
End of period	55,763	58,519
RECONCILIATION OF CASH, CASH EQUIVALENTS AND RESTRICTED CASH TO THE CONSOLIDATED BALANCE SHEETS:
Cash and cash equivalents	53,875	58,519
Restricted cash reported in prepaid expenses and other current assets	$ 1,888
Restricted Cash and Cash Equivalents, Current, Statement of Financial Position [Extensible Enumeration]	Prepaid Expense and Other Assets, Current
Total cash, cash equivalents and restricted cash	$ 55,763	58,519
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION
Interest (net of capitalized interest of $126 and $120, respectively)	993	1,539
Income taxes	2,411	1,660
SUPPLEMENTAL DISCLOSURES OF NON-CASH INVESTING AND FINANCING ACTIVITIES
Property and equipment purchases in accounts payable	2,442	1,688
Merit common stock surrendered (0 and 2 shares, respectively) in exchange for exercise of stock options		93
Right-of-use operating lease assets obtained in exchange for operating lease liabilities	$ 1,404	$ 131