GOODWILL AND OTHER INTANGIBLE ASSETS (Amortizable Other Intangible Assets) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Cost	$ 615,764	$ 610,711
Accumulated Amortization	288,337	264,911
Net	327,427	345,800
Total permits and other intangible assets, Cost	739,692	734,039
Total permits and other intangible assets, Net	451,355	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	123,928	123,328
Permits
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Cost	177,628	174,721
Accumulated Amortization	78,419	74,347
Net	99,209	100,374
Customer and supplier relationships
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Cost	400,292	399,224
Accumulated Amortization	178,506	158,972
Net	221,786	240,252
Other intangible assets
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Cost	37,844	36,766
Accumulated Amortization	31,412	31,592
Net	$ 6,432	$ 5,174