CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 27,841	$ (25,221)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	63,173	70,458
Gain on sale of business		(508)
Loss on sales and/or abandonment of property and equipment	630	1,303
Write-off of certain intangible assets and other long-term assets	4,412	28,409
Amortization of right-of-use operating lease assets	8,941	9,522
Fair value adjustments to contingent consideration	3,322	884
Amortization of deferred credits	(81)	(103)
Amortization of long-term debt issuance costs	453	453
Stock-based compensation expense	11,589	10,268
Changes in operating assets and liabilities, net of acquisitions and divestitures:
Trade receivables	(6,180)	13,049
Other receivables	(3,173)	1,170
Inventories	(11,180)	15,668
Prepaid expenses and other current assets	(6,251)	(3,929)
Prepaid income taxes		(35)
Income tax refund receivables	960	(8,666)
Other assets	(3,638)	(1,088)
Trade payables	1,181	(2,682)
Accrued expenses	19,575	22,591
Income taxes payable	(1,600)	1,079
Deferred compensation payable	606	541
Operating lease liabilities	(9,365)	(9,398)
Other long-term obligations	201	4,590
Total adjustments	73,575	153,576
Net cash provided by operating activities	101,416	128,355
Capital expenditures for:
Property and equipment	(19,612)	(35,590)
Intangible assets	(2,121)	(2,499)
Proceeds from the sale of property and equipment	1,037	33
Proceeds from sale of business		1,285
Cash received for settlement of current note receivable		250
Cash paid in acquisitions, net of cash acquired	(1,858)	(260)
Net cash used in investing activities	(22,554)	(36,781)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common stock	17,814	4,954
Proceeds from issuance of long-term debt	73,251	46,051
Payments on long-term debt	(145,876)	(128,306)
Contingent payments related to acquisitions	(10,579)	(12,991)
Payment of taxes related to an exchange of common stock	(576)	(866)
Net cash used in financing activities	(65,966)	(91,158)
Effect of exchange rates on cash	(908)	(185)
Net increase in cash and cash equivalents	11,988	231
CASH AND CASH EQUIVALENTS:
Beginning of period	56,916	44,320
End of period	68,904	44,551
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION
Interest (net of capitalized interest of $345 and $679, respectively)	4,155	8,138
Income taxes	6,166	6,449
SUPPLEMENTAL DISCLOSURES OF NON-CASH INVESTING AND FINANCING ACTIVITIES
Property and equipment purchases in accounts payable	2,842	2,726
Current note receivable converted to equity investment		899
Proceeds from sale of business in other receivables		321
Merit common stock surrendered (3 and 39 shares, respectively) in exchange for exercise of stock options	179	1,467
Right-of-use operating lease assets obtained in exchange for operating lease liabilities	$ 827	$ 7,285