ACCOUNTING POLICIES AND PRONOUNCEMENTS (Narrative) (Details) - USD ($) $ in Thousands		3 Months Ended				9 Months Ended
	Jan. 01, 2018	Sep. 30, 2018		Sep. 30, 2017	[1]	Sep. 30, 2018		Sep. 30, 2017		Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification out of AOCI to retained earnings	$ 1,100	$ 0	[1]	$ 0		$ 1,148	[1]	$ 0	[1]
Decrease to accumulated other comprehensive income		$ (4,450)				(4,450)				$ 6,965
Cumulative effect of adjustment										$ (69,732)
Reclassification of cash used in operating activities						139,818		24,318
Reclassification of cash used in investing activities						$ 654,149		245,040
Accounting Standard Update 2017-12 | New Accounting Pronouncement, Early Adoption, Effect
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease to accumulated other comprehensive income	700
Cumulative effect of adjustment	$ 700
Accounting Standards Update 2016-18
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification of cash used in operating activities								39,700
Reclassification of cash used in investing activities								2,500
Increase in restricted cash								$ 37,200

[1] The Company adopted Accounting Standards Update ("ASU") 2018-02, Income Statement-Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income, as of January 1, 2018. See Note 2 - Accounting Policies and Pronouncements for further discussion.