v3.5.0.2
FAIR VALUE MEASUREMENTS Narrative (Details)
Jun. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
Feb. 26, 2014
USD ($)
Dec. 31, 2013
USD ($)
Axeon [Member]        
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]        
Equity method losses in excess of investment     $ 21,300,000  
Investment in joint venture       $ 0
Axeon [Member]        
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]        
Maximum amount of guarantees $ 125,000,000      
Axeon Term Loan receivable 190,000,000      
Carrying amount, Axeon Term Loan 170,460,000 $ 170,352,000    
Guarantee liability 1,800,000      
Axeon [Member] | Financial Standby Letter of Credit [Member]        
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]        
Amount of guarantees provided 25,500,000      
Axeon [Member] | Financial Guarantee [Member]        
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]        
Amount of guarantees provided $ 76,500,000 $ 71,900,000    
Number of guarantees with unlimited exposure 1 2    
Axeon [Member]        
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]        
Ownership percentage of entity sold     50.00%