Unaudited Condensed Consolidated Statement of Operations Statement - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Product Information [Line Items]
Document Period End Date			Jun. 30, 2019
Revenue from External Customers	$ 812,572	$ 796,092	$ 1,610,784	$ 1,590,574
Costs and Expenses	(621,426)	(607,965)	(1,227,804)	(1,206,685)
Operating profit	191,146	188,127	382,980	383,889
General and administrative expenses	(29,370)	(31,136)	(71,900)	(65,920)
(Losses) gains on divestitures and impairment charges, net	(11,823)	6,865	(13,701)	7,347
Hurricane Expenses, Net of Insurance Proceeds	152	(1,902)	(296)	330
Operating income	150,105	161,954	297,083	325,646
Interest expense	(47,317)	(44,519)	(94,707)	(88,095)
Loss on early extinguishment of debt, net	(7,579)	0	(7,579)	(10,131)
Other income, net	874	1,880	1,594	2,264
Income before income taxes	96,083	119,315	196,391	229,684
Provision for income taxes	(23,570)	(16,034)	(44,665)	(44,355)
Net Income	72,513	103,281	151,726	185,329
Net (income) loss attributable to noncontrolling interests	(184)	(42)	(74)	(102)
Net income attributable to common stockholders	$ 72,329	$ 103,239	$ 151,652	$ 185,227
Basic earnings per share:
Net income attributable to common stockholders, basic	$ 0.40	$ 0.57	$ 0.83	$ 1.01
Basic weighted average number of shares	182,369	182,637	182,048	183,877
Diluted earnings per share:
Net income attributable to common stockholders, diluted	$ 0.39	$ 0.55	$ 0.82	$ 0.98
Diluted weighted average number of shares	185,690	187,188	185,517	188,547
Dividends declared per share	$ 0.18	$ 0.17	$ 0.18	$ 0.17
Product [Member]
Product Information [Line Items]
Revenue from External Customers	$ 415,492	$ 397,600	$ 796,701	$ 765,814
Costs and Expenses	(213,635)	(209,925)	(411,529)	(397,648)
Service [Member]
Product Information [Line Items]
Revenue from External Customers	339,090	334,450	694,461	712,548
Costs and Expenses	(193,378)	(188,293)	(384,191)	(379,141)
Product and Service, Other [Member]
Product Information [Line Items]
Revenue from External Customers	57,990	64,042	119,622	112,212
Costs and Expenses	$ (214,413)	$ (209,747)	$ (432,084)	$ (429,896)