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VARIABLE INTEREST ENTITIES - Consolidated Entities (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Consolidated Variable Interest Entities      
Noncontrolling interest included in consolidated statements of financial position (in dollars) $ 109,443   $ 109,147
Interest expense (in dollars) $ 36,349 $ 35,420  
Springerville Partnership | Primary Beneficiary      
Consolidated Variable Interest Entities      
Equity interest (as a percent) 51.00%    
General partner interest (as a percent) 1.00%    
Ownership interest held by noncontrolling interest (as a percent) 49.00%   49.00%
Noncontrolling interest included in consolidated statements of financial position (in dollars) $ 109,400   $ 109,100
Depreciation and amortization (in dollars) 5,300 5,300  
Interest expense (in dollars) 7,200 $ 7,700  
Springerville Partnership | Primary Beneficiary | Electric Plant      
Consolidated Variable Interest Entities      
Assets of variable interest entity included in consolidated statements of financial position (in dollars) 827,000   832,300
Springerville Partnership | Primary Beneficiary | Long-term debt      
Consolidated Variable Interest Entities      
Liabilities of variable interest entity included in consolidated statements of financial position (in dollars) 432,400   472,100
Springerville Partnership | Primary Beneficiary | Accrued interest included in long-term debt      
Consolidated Variable Interest Entities      
Liabilities of variable interest entity included in consolidated statements of financial position (in dollars) $ 5,000   $ 13,400
Springerville Partnership | Primary Beneficiary | Springerville 3 Lease      
Consolidated Variable Interest Entities      
Percentage of financial and other support provided 100.00%    
Springerville Partnership | Springerville Unit 3 Holding LLC      
Consolidated Variable Interest Entities      
Ownership interest held by parent (as a percent) 100.00%