Consolidated Statement of Cash Flows Statement - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash Flows from Operating Activities:
Net income (loss)	$ 57,310	$ (79,760)	$ 98,620
Income from discontinued operations	0	0	36,680
Income (loss) from continuing operations	57,310	(79,760)	61,940
Adjustments to reconcile income to net cash provided by operating activities, net of acquisition impact:
Impairment of goodwill and indefinite-lived intangible assets	0	134,600	0
Loss on dispositions of assets	130	1,290	150
Depreciation	31,890	29,020	24,870
Amortization of intangible assets	21,560	20,750	18,630
Amortization of debt issue costs	960	1,150	1,130
Deferred income taxes	1,680	(33,710)	2,100
Non-cash compensation expense	9,500	8,170	6,450
Debt financing and related expenses	10,520	0	0
Non-cash change in legacy liability estimate	1,450	23,400	0
(Increase) decrease in receivables	(11,180)	9,580	3,280
(Increase) decrease in inventories	(960)	3,980	740
(Increase) decrease in prepaid expenses and other assets	5,030	4,400	(6,930)
Increase (decrease) in accounts payable and accrued liabilities	2,120	4,490	(12,780)
Other operating activities	4,210	50	(3,870)
Net cash provided by operating activities of continuing operations	134,220	127,410	95,710
Net cash provided by (used for) operating activities of discontinued operations	0	0	(20,110)
Net cash provided by operating activities	134,220	127,410	75,600
Cash Flows from Investing Activities:
Capital expenditures	(45,060)	(40,480)	(29,670)
Acquisition of businesses, net of cash acquired	(34,340)	(193,540)	(67,090)
Net proceeds from dispositions businesses, property and equipment	220	1,950	128,080
Net cash provided by (used for) investing activities of continuing operations	(79,180)	(232,070)	31,320
Net cash used for investing activities of discontinued operations	0	0	(2,240)
Net cash provided by (used for) investing activities	(79,180)	(232,070)	29,080
Cash Flows from Financing Activities:
Retirement of senior notes	(300,000)	0	0
Proceeds from issuance of senior notes	400,000	0	0
Proceeds from borrowings on revolving credit facilities	0	367,280	189,060
Repayments of borrowings on revolving credit facilities	(48,620)	(319,120)	(189,340)
Debt financing fees and senior notes redemption premium	(13,570)	0	0
Payments to purchase common stock	(19,090)	(39,420)	(36,740)
Shares surrendered upon exercise and vesting of equity awards to cover taxes	(5,230)	(2,600)	(3,340)
Dividends paid	(1,740)	0	0
Net cash provided by (used for) financing activities of continuing operations	11,750	6,140	(40,360)
Net cash provided by financing activities of discontinued operations	0	0	0
Net cash provided by (used for) financing activities	11,750	6,140	(40,360)
Increase (decrease) for the year	66,790	(98,520)	64,320
At beginning of year	73,950	172,470	108,150
At end of year	140,740	73,950	172,470
Supplemental disclosure of cash flow information:
Cash paid for interest	13,280	13,210	12,430
Cash paid for income taxes	$ 10,520	$ 9,060	$ 44,020