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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2019
Entity [Line Items]
Equity Method Investment, Ownership Percentage	50.00%
Contract Liabilities, Contract Term	5 to 10 years
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%	35.00%
General partner ownership interest	100.00%
Common stock	$ 29,040	$ 1,203,981	$ 471,358
Noncontrolling interests in consolidated subsidiaries		$ (195,000)	$ 2,146,462
Number Of Years Of Service Employees Must Work To Be Entitled To Postretirement Medical And Life Insurance Benefits			5 years
Accounting Standards Update 2016-02 [Member]
Entity [Line Items]
Finance lease assets - PPE				$ 28,100
Present value of lease liabilities				$ 28,000

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Present value of lessee's discounted obligation for lease payments from finance lease.

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