GOODWILL AND INTANGIBLE ASSETS (Gross Carrying Amount and Accumulated Amortization by Major Intangible Asset Class) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount		$ 1,190,980	$ 874,550
Accumulated amortization		(127,350)	(105,498)
Total Intangible Assets Subject to Amortization, net		1,063,630	769,052
Intangible Assets with Indefinite Lives		0	0
Total Intangible Assets, net		1,063,630	769,052
Amortization Expense for the Year		23,765	17,565	$ 15,618
Contractual Rights In Place [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount		1,050,816	742,085
Accumulated amortization		(94,534)	(77,515)
Noncompetition Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount		7,067	6,757
Accumulated amortization		(2,440)	(1,118)
Favorable Lease Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount		9,479	9,479
Accumulated amortization		(3,179)	(2,822)
Permitting Permitting Compliance And Zoning Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount		119,002	112,058
Accumulated amortization		(24,352)	(21,701)
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	[1]	4,616	4,171
Accumulated amortization	[1]	$ (2,845)	$ (2,342)

[1] Includes customer relationships and tradenames and trademarks.