GOODWILL AND OTHER INTANGIBLE ASSETS (Amortizable Other Intangible Assets) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Cost	$ 611,760	$ 610,711
Accumulated Amortization	278,680	264,911
Net	333,080	345,800
Total permits and other intangible assets, Cost	734,600	734,039
Total permits and other intangible assets, Net	455,920	469,128
Indefinite lived trademarks and trade names
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Indefinite lived trademarks and trade names	122,840	123,328
Permits
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Cost	175,317	174,721
Accumulated Amortization	76,707	74,347
Net	98,610	100,374
Customer and supplier relationships
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Cost	399,012	399,224
Accumulated Amortization	170,866	158,972
Net	228,146	240,252
Other intangible assets
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Cost	37,431	36,766
Accumulated Amortization	31,107	31,592
Net	$ 6,324	$ 5,174