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CONTINGENCIES AND COMMITMENTS (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2018	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2017
Commitments And Contingencies Disclosure Abstract
Proceeds from Sales of Business, Affiliate and Productive Assets	$ 70,200
Letter of credit requirement		$ 5,862		$ 5,862
OtherCommitmentsLineItems
RestrictedCash		0		69,365
CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents		30,331		192,258	$ 39,926	$ 34,167
Cash and Cash Equivalents Member
OtherCommitmentsLineItems
Cash			$ 30,331	122,893
RestrictedCash		0		69,365
CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents		$ 30,331		$ 192,258