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COMMITMENTS AND CONTINGENCIES (Minimum Rentals Under Non-Cancelable Operating Leases) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
COMMITMENTS AND CONTINGENCIES      
Amount of outstanding letters of credit and surety bonds $ 118,900 $ 86,100  
Contractual rental expense, including participation rent 8,400 $ 9,100 $ 7,300
Ground lease payments      
2017 9,885    
2018 8,534    
2019 7,560    
2020 7,715    
2021 7,568    
Subsequent/Other 298,881    
Total $ 340,143