ACQUISITIONS AND DIVESTITURES (Schedule Of Business Acquisitions) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017		Dec. 31, 2016	Dec. 31, 2015
ACQUISITIONS AND DIVESTITURES [Abstract]
Cash	$ 1,072,978
Payable to seller	7,837
Total fair value of purchase consideration	1,080,815		$ 33,287	$ 47,198
Accounts and notes receivable, net	14,955
Inventories	21,679
Other current assets	608
Investments	3,590
Property, plant & equipment	433,606
Contractual rights in place	295,482
Liabilities assumed	(3,894)
Net identifiable assets acquired and retained	766,026
Goodwill	27,497	[1]
Net Assets Divested Immediately Upon Acquisition	$ 287,292

[1] See Note 19 for a summary of the current year acquisitions