Consolidated Statement of Cash Flows Statement - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash Flows from Operating Activities:
Net income (loss)	$ 24,900	$ (2,580)
Adjustments to reconcile income to net cash provided by operating activities, net of acquisition impact:
Loss on dispositions of assets	130	1,010
Depreciation	15,830	14,770
Amortization of intangible assets	10,780	10,150
Amortization of debt issue costs	520	570
Deferred income taxes	1,790	(1,460)
Non-cash compensation expense	5,660	4,680
Non-cash change in legacy liability estimate	0	23,400
Debt financing and related expenses	10,520	0
Increase in receivables	(22,600)	(12,300)
(Increase) decrease in inventories	(900)	5,260
(Increase) decrease in prepaid expenses and other assets	(7,430)	290
Increase (decrease) in accounts payable and accrued liabilities	1,350	(14,530)
Other operating activities	2,120	1,580
Net cash provided by operating activities, net of acquisition impact	42,670	30,840
Cash Flows from Investing Activities:
Capital expenditures	(18,330)	(9,250)
Acquisition of businesses, net of cash acquired	0	(95,160)
Net proceeds from disposition of business, property and equipment	140	2,110
Net cash used for investing activities	(18,190)	(102,300)
Cash Flows from Financing Activities:
Retirement of senior notes	(300,000)	0
Proceeds from issuance of senior notes	400,000	0
Proceeds from borrowings on revolving credit facilities	0	245,700
Repayments of borrowings on revolving credit facilities	(48,620)	(247,320)
Debt financing fees and senior notes redemption premium	(13,570)	0
Shares surrendered upon exercise and vesting of equity awards to cover taxes	(4,620)	(2,570)
Payments to purchase common stock	(14,210)	(31,570)
Net cash provided by (used for) financing activities	18,980	(35,760)
Increase (decrease) for the period	43,460	(107,220)
At beginning of period	73,950	172,470
At end of period	117,410	65,250
Supplemental disclosure of cash flow information:
Cash paid for interest	6,170	7,150
Cash paid for taxes	$ 4,420	$ 3,410