Unaudited Condensed Consolidated Statement of Operations Statement - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Product Information [Line Items]
Document Period End Date			Sep. 30, 2019
Revenue from External Customers	$ 769,241	$ 778,786	$ 2,380,025	$ 2,369,360
Costs and Expenses	(609,509)	(612,616)	(1,837,313)	(1,819,301)
Operating profit	159,732	166,170	542,712	550,059
General and administrative expenses	(29,406)	(41,070)	(101,306)	(106,990)
(Losses) gains on divestitures and impairment charges, net	(1,479)	7,970	(15,180)	15,317
Hurricane Expenses, Net of Insurance Proceeds	(262)	(767)	(558)	(437)
Operating income	128,585	132,303	425,668	457,949
Interest expense	(46,678)	(46,419)	(141,385)	(134,514)
Losses on early extinguishment of debt, net	(9,058)	0	(16,637)	(10,131)
Other income, net	20	152	1,614	2,416
Income before income taxes	72,869	86,036	269,260	315,720
Provision for income taxes	(1,997)	(17,043)	(46,662)	(61,398)
Net Income	70,872	68,993	222,598	254,322
Net income attributable to noncontrolling interests	(80)	(58)	(154)	(160)
Net income attributable to common stockholders	$ 70,792	$ 68,935	$ 222,444	$ 254,162
Basic earnings per share:
Net income attributable to common stockholders, basic	$ 0.39	$ 0.38	$ 1.22	$ 1.39
Basic weighted average number of shares	182,551	180,858	182,218	182,859
Diluted earnings per share:
Net income attributable to common stockholders, diluted	$ 0.38	$ 0.37	$ 1.20	$ 1.36
Diluted weighted average number of shares	185,843	185,460	185,635	187,517
Dividends declared per share	$ 0.18	$ 0.17	$ 0.18	$ 0.17
Product [Member]
Product Information [Line Items]
Revenue from External Customers	$ 375,398	$ 392,410	$ 1,172,099	$ 1,158,224
Costs and Expenses	(197,544)	(203,349)	(609,073)	(600,997)
Service [Member]
Product Information [Line Items]
Revenue from External Customers	332,838	323,246	1,027,299	1,035,794
Costs and Expenses	(192,262)	(188,893)	(576,453)	(568,034)
Product and Service, Other [Member]
Product Information [Line Items]
Revenue from External Customers	61,005	63,130	180,627	175,342
Costs and Expenses	$ (219,703)	$ (220,374)	$ (651,787)	$ (650,270)