Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash flows from operating activities:
Net income	$ 69,326	$ 38,739
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	65,279	53,844
Amortization of debt issuance costs	1,106	1,118
Equity-based compensation	3,221	3,021
Increase in deferred income taxes	(20,108)	(7,102)
(Gain) loss on asset sales and disposals, net	(5,621)	1,103
Changes in operating assets and liabilities, net of effects from acquisitions:
Decrease in accounts receivable, net	3,066	2,831
(Increase) decrease in income taxes receivable	(13,882)	6,055
Increase in prepaid and other current assets	(8,857)	(8,341)
Increase (decrease) in accounts payable and accrued liabilities	(13,789)	1,442
Increase in deferred revenue	1,246	820
Other, net	(2,703)	(3,356)
Net cash provided by operating activities	118,500	104,378
Cash flows from investing activities:
Purchase of business, net of cash acquired	0	(356,917)
Capital expenditures	(64,757)	(46,627)
Decrease in accrued expenses related to capital expenditures	(8,238)	(7,751)
Proceeds from sales of property, plant and equipment	518	6,326
Issuance of note receivable	(3,540)	0
Net cash used in investing activities	(76,017)	(404,969)
Cash flows from financing activities:
Proceeds from long-term debt borrowings	100,000	250,000
Payment of debt issuance costs	0	(2,410)
Payments on long-term debt	(7,260)	(4,531)
Repurchases of common stock	0	(5,073)
Payment of withholding tax for equity awards	(5,796)	(2,554)
Dividends paid to stockholders	(12,804)	(11,395)
Net cash provided by financing activities	74,140	224,037
Increase (decrease) in cash and cash equivalents	116,623	(76,554)
Cash and cash equivalents, beginning of period	125,271	264,113
Cash and cash equivalents, end of period	241,894	187,559
Supplemental cash flow disclosures:
Cash paid for interest, net of capitalized interest	17,152	9,421
Cash paid for income taxes, net of refunds received	$ (930)	$ (59)