Consolidated Statement of Cash Flows Statement - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash Flows from Operating Activities:
Net income (loss)	$ (79,760)	$ 98,620	$ 83,300
Income from discontinued operations	0	36,680	9,590
Income (loss) from continuing operations	(79,760)	61,940	73,710
Adjustments to reconcile income to net cash provided by operating activities, net of acquisition impact:
Impairment of goodwill and indefinite-lived intangible assets	134,600	0	0
Loss on dispositions of assets	1,290	150	90
Depreciation	29,020	24,870	22,230
Amortization of intangible assets	20,750	18,630	18,260
Amortization of debt issue costs	1,150	1,130	1,290
Deferred income taxes	(33,710)	2,100	5,810
Non-cash compensation expense	8,170	6,450	7,170
Non-cash change in legacy liability estimate	23,400	0	0
(Increase) decrease in receivables	9,580	3,280	(9,570)
(Increase) decrease in inventories	3,980	740	(14,680)
(Increase) decrease in prepaid expenses and other assets	4,400	(6,930)	8,790
Increase (decrease) in accounts payable and accrued liabilities	4,490	(12,780)	(2,330)
Other operating activities	50	(3,870)	10
Net cash provided by operating activities of continuing operations	127,410	95,710	110,780
Net cash provided by (used for) operating activities of discontinued operations	0	(20,110)	18,540
Net cash provided by operating activities	127,410	75,600	129,320
Cash Flows from Investing Activities:
Capital expenditures	(40,480)	(29,670)	(23,420)
Acquisition of businesses, net of cash acquired	(193,540)	(67,090)	0
Net proceeds from dispositions businesses, property and equipment	1,950	128,080	60
Net cash provided by (used for) investing activities of continuing operations	(232,070)	31,320	(23,360)
Net cash used for investing activities of discontinued operations	0	(2,240)	(1,440)
Net cash provided by (used for) investing activities	(232,070)	29,080	(24,800)
Cash Flows from Financing Activities:
Proceeds from borrowings on revolving credit and accounts receivable facilities	367,280	189,060	59,060
Repayments of borrowings on revolving credit and accounts receivable facilities	(319,120)	(189,340)	(68,490)
Payments to purchase common stock	(39,420)	(36,740)	(12,140)
Shares surrendered upon exercise and vesting of equity awards to cover taxes	(2,600)	(3,340)	(2,380)
Other financing activities	0	0	0
Net cash provided by (used for) financing activities of continuing operations	6,140	(40,360)	(23,950)
Net cash provided by financing activities of discontinued operations	0	0	0
Net cash provided by (used for) financing activities	6,140	(40,360)	(23,950)
Increase (decrease) for the year	(98,520)	64,320	80,570
At beginning of year	172,470	108,150	27,580
At end of year	73,950	172,470	108,150
Supplemental disclosure of cash flow information:
Cash paid for interest	13,210	12,430	13,800
Cash paid for income taxes	$ 9,060	$ 44,020	$ 7,380