DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Changes in Value Recognized in OCI (Details) - Cash Flow Hedge - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Losses reclassified from AOCI to income
Gain (Loss) recognized in OCI on derivatives	$ 29,714	$ (10,733)
Gain (Loss) reclassified from AOCI to income	50,509	(11,922)
Interest rate contracts
Losses reclassified from AOCI to income
Gain (Loss) recognized in OCI on derivatives	27,739	(10,597)
Interest rate contracts \| Interest and debt expense
Losses reclassified from AOCI to income
Gain (Loss) reclassified from AOCI to income	50,509	(11,922)
Commodity derivatives
Losses reclassified from AOCI to income
Gain (Loss) recognized in OCI on derivatives	$ 1,975	$ (136)

Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=109978405&loc=d3e80720-113993

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580

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