Consolidated Statement of Cash Flows Statement - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash Flows from Operating Activities:
Net income	$ 98,620	$ 83,300	$ 30,960
Income (loss) from discontinued operations	36,680	9,590	(5,000)
Income from continuing operations	61,940	73,710	35,960
Adjustments to reconcile income to net cash provided by operating activities, net of acquisition impact:
Loss (gain) on dispositions of assets	150	90	(3,340)
Depreciation	24,870	22,230	21,770
Amortization of intangible assets	18,630	18,260	18,540
Amortization of debt issue costs	1,130	1,290	1,320
Deferred income taxes	2,100	5,810	15,830
Non-cash compensation expense	6,450	7,170	6,780
Debt financing and related expenses	0	0	6,640
(Increase) decrease in receivables	3,280	(9,570)	3,980
(Increase) decrease in inventories	740	(14,680)	4,620
(Increase) decrease in prepaid expenses and other assets	(6,930)	8,790	(490)
Increase (decrease) in accounts payable and accrued liabilities	(12,780)	(2,330)	4,450
Other operating activities	(3,870)	10	2,750
Net cash provided by operating activities of continuing operations	95,710	110,780	118,810
Net cash provided by (used for) operating activities of discontinued operations	(20,110)	18,540	1,250
Net cash provided by operating activities	75,600	129,320	120,060
Cash Flows from Investing Activities:
Capital expenditures	(29,670)	(23,420)	(33,710)
Acquisition of businesses, net of cash acquired	(67,090)	0	0
Net proceeds from dispositions businesses, property and equipment	128,080	60	4,420
Net cash provided by (used for) investing activities of continuing operations	31,320	(23,360)	(29,290)
Net cash used for investing activities of discontinued operations	(2,240)	(1,440)	(3,060)
Net cash provided by (used for) investing activities	29,080	(24,800)	(32,350)
Cash Flows from Financing Activities:
Proceeds from borrowings on revolving credit and accounts receivable facilities	189,060	59,060	401,300
Repayments of borrowings on revolving credit and accounts receivable facilities	(189,340)	(68,490)	(517,310)
Payments to purchase common stock	(36,740)	(12,140)	0
Shares surrendered upon exercise and vesting of equity awards to cover taxes	(3,340)	(2,380)	(510)
Proceeds from issuance of senior notes	0	0	300,000
Repayments of borrowings on term loan facilities	0	0	(257,940)
Debt financing fees	0	0	(6,070)
Other financing activities	0	0	(310)
Net cash used for financing activities of continuing operations	(40,360)	(23,950)	(80,840)
Net cash provided by financing activities of discontinued operations	0	0	0
Net cash used for financing activities	(40,360)	(23,950)	(80,840)
Increase for the year	64,320	80,570	6,870
At beginning of year	108,150	27,580	20,710
At end of year	172,470	108,150	27,580
Supplemental disclosure of cash flow information:
Cash paid for interest	12,430	13,800	9,430
Cash paid for income taxes	$ 44,020	$ 7,380	$ 16,230