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EQUITY COMPENSATION (Options) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Black-Scholes option pricing model      
Weighted average assumptions used to measure the fair value of each options granted using Black-Scholes option-pricing model      
Weighted average expected dividend yield     5.00%
Minimum | Black-Scholes option pricing model      
Weighted average assumptions used to measure the fair value of each options granted using Black-Scholes option-pricing model      
Risk-free interest rate     1.71%
Expected volatility factor     35.00%
Expected life in years     6 years 7 months 27 days
Maximum | Black-Scholes option pricing model      
Weighted average assumptions used to measure the fair value of each options granted using Black-Scholes option-pricing model      
Risk-free interest rate     1.80%
Expected volatility factor     36.00%
Expected life in years     7 years 5 months 26 days
Stock Options      
Equity compensation      
Number of common units which holder is entitle to purchase 1    
Term of option P10Y    
Unrecognized compensation expenses $ 21,000    
Weighted average period of compensation expense expected to be recognized 1 year 4 months 6 days    
Stock option exercise $ 1,100    
Tax benefit realized from exercise of stock options $ 100    
Options      
Balance at the beginning of the period (in units) 22,232,134    
Granted (in units) 0 0  
Exercised (in units) (54,500)    
Expired (in units) (523,440)    
Forfeited (in units) (1,159,169)    
Balance at the end of the period (in units) 20,495,025 22,232,134  
Exercisable at the end of the period (in units) 7,369,430    
Weighted Average Exercise Price      
Balance at the beginning of the period (in dollars per unit) $ 18.99    
Granted (in dollars per unit) 0.00    
Exercised (in dollars per unit) 19.00    
Expired (in dollars per unit) 19.00    
Forfeited (in dollars per unit) 19.00    
Balance at the end of the period (in dollars per unit) 18.99 $ 18.99  
Exercisable at the end of the period (in dollars per unit) $ 19.00    
Weighted Average Remaining Life      
Weighted average remaining life (in years)   7 years 4 months 6 days  
Expected to vest at the end of the period 6 years 1 month 2 days    
Exercisable at the end of the period 5 years 7 months 13 days    
Aggregate Intrinsic Value      
Balance - January 1, 2017 $ 4,586    
Exercised 205    
Exercisable at December 31, 2017 20,611 $ 4,586  
Exercisable at December 31, 2017 $ 7,369    
Weighted average assumptions used to measure the fair value of each options granted using Black-Scholes option-pricing model      
Annual award vesting percentage 33.33%