Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities:
Net income	$ 178,582	$ 164,760	$ 235,171
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	216,687	197,731	181,619
Amortization of debt issuance costs	4,646	4,163	3,174
Equity-based compensation	12,300	10,486	10,743
Write-off of debt issuance costs	4,210	110	613
Increase (decrease) in deferred income taxes	(50,011)	(34,973)	87,223
Loss on asset disposals, net	7,187	14,167	574
Changes in operating assets and liabilities, net of effects from acquisitions:
(Increase) decrease in accounts receivable, net	(3,520)	(17)	18,146
(Increase) decrease in income taxes receivable	8,567	10,618	(16,784)
(Increase) decrease in prepaid and other current assets	(462)	(2,192)	5,073
Increase (decrease) in accounts payable and accrued liabilities	16,452	(27,853)	6,874
Increase (decrease) in deferred revenue	(1,432)	3,946	(20,547)
Other, net	(1,487)	(3,123)	(12,947)
Net cash provided by operating activities	491,741	407,769	324,486
Cash flows from investing activities:
Purchase of businesses, net of cash acquired	(883,440)	0	(727,947)
Capital expenditures	(262,352)	(217,766)	(179,363)
Change in accrued expenses related to capital expenditures	4,511	2,005	4,167
Proceeds from sales of property, plant and equipment	7,039	1,466	11,976
Net cash used in investing activities	(1,134,242)	(214,295)	(891,167)
Cash flows from financing activities:
Proceeds from issuance of long-term debt	1,275,000	0	750,000
Payment of debt issuance costs	(11,844)	(2,131)	(15,224)
Payments on long-term debt	(702,880)	(14,391)	(100,642)
Repurchases of common stock	(5,073)	(26,582)	(528)
Payment of withholding tax for equity awards	(3,017)	(7,155)	(4,983)
Dividends paid to stockholders	(48,527)	(42,854)	(37,216)
Other	0	2,000	(1,014)
Net cash provided by (used in) financing activities	503,659	(91,113)	590,393
Increase (decrease) in cash and cash equivalents	(138,842)	102,361	23,712
Cash and cash equivalents, beginning of period	264,113	161,752	138,040
Cash and cash equivalents, end of period	125,271	264,113	161,752
Supplemental cash flow disclosures:
Cash paid for interest, net of capitalized interest	67,907	56,412	43,327
Cash paid for income taxes, net of refunds received	$ (3,585)	$ 1,811	$ 59,622