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VARIABLE INTEREST ENTITIES - Summary of the Carrying Value of the Assets and Liabilities and Maximum Loss Exposure for the Alternative Energy Partnerships (Details) - Variable Interest Entity, Not Primary Beneficiary - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Variable Interest Entity [Line Items]    
Cash $ 3,012 $ 16,518
Equipment, net of depreciation 259,464 246,297
Other assets 4,470 2,444
Total unconsolidated assets 266,946 265,259
Total unconsolidated liabilities 6,269 7,181
Maximum loss exposure $ 28,988 $ 98,910