Consolidated Statements of Operations and Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues	$ 1,167,997	$ 1,072,295	$ 959,956
Costs and Expenses:
Operating (excluding depreciation and amortization)	388,552	370,269	337,040
Selling, general and administrative	245,120	222,216	204,384
Depreciation and amortization	216,687	197,731	181,619
Loss on asset disposals, net	7,187	14,167	574
Total Costs and Expenses	857,546	804,383	723,617
Income from operations	310,451	267,912	236,339
Interest expense	(71,729)	(60,415)	(46,864)
Other income (expense), net	(4,907)	4,487	668
Income before income taxes	233,815	211,984	190,143
Income tax provision (benefit)	55,233	47,224	(45,028)
Net income	$ 178,582	$ 164,760	$ 235,171
Net income per common share:
Basic (in dollars per share)	$ 31.45	$ 28.98	$ 41.40
Diluted (in dollars per share)	$ 31.12	$ 28.77	$ 40.92
Weighted average common shares outstanding:
Basic (in shares)	5,678,990	5,684,375	5,680,073
Diluted (in shares)	5,737,856	5,725,963	5,747,037
Deferred gain (loss) on cash flow hedges and other, net of tax	$ (68,062)	$ 256	$ 94
Comprehensive income	$ 110,520	$ 165,016	$ 235,265