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EQUITY-BASED COMPENSATION - Restricted Stock and Stock Options (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 23, 2016
Feb. 19, 2016
Nov. 10, 2014
Apr. 30, 2014
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2014
Nov. 09, 2014
Restricted stock and RSUs                
Number of shares                
Unvested Balance at the beginning of the period (in shares)         8,504,190 5,123,481    
Granted (in shares)         2,569,302 3,459,111    
Forfeited (in shares)         (29,491) (24,096)    
Vested (in shares)         (1,041,696) (179,348)    
Unvested Balance at the end of the period (in shares)         10,002,305 8,379,148    
Weighted Average Grant Date Fair Value                
Unvested Balance at the beginning of the period (in dollars per share)         $ 26.70 $ 28.67    
Granted (in dollars per share)         37.03 24.06    
Forfeited (in dollars per share)         29.12 27.36    
Vested (in dollars per share)         26.82 31.01    
Unvested Balance at the end of the period (in dollars per share)         $ 29.50 $ 26.84    
Total compensation expense not yet recognized         $ 157,529      
Weighted average period to recognize compensation expense         2 years      
RSUs                
Equity-based compensation                
Compensation expenses         $ 24,463 $ 14,853    
RSUs | Minimum                
Equity-based compensation                
Vesting period         4 years      
RSUs | Maximum                
Equity-based compensation                
Vesting period         5 years      
Stock options                
Equity-based compensation                
Vesting period             5 years  
Compensation expenses         $ 752 $ 943    
Weighted average remaining period for recognition of unrecognized compensation cost         1 year 7 months 6 days      
Weighted Average Grant Date Fair Value                
Total compensation expense not yet recognized         $ 5,263      
Assumptions used to estimate fair value                
Expected life (in years)         6 years      
Weighted-average risk free interest rate (as a percent)         1.91%      
Expected volatility (as a percent)         35.00%      
Dividend yield (as a percent)         2.72%      
Weighted - average fair value at grant date         $ 6.70      
Special dividends paid (in dollars per share) $ 1.25 $ 0.80 $ 1.00          
Reduction to exercise price of options outstanding due to special dividend paid (in dollars per share)     $ 3.05          
Exercise price (in dollars per share) $ 21.95             $ 25.00
Number Outstanding                
Outstanding at the beginning of the period (in shares         2,822,728 3,081,203    
Grants (in shares)       3,501,881        
Forfeiture or expirations (in shares)         (35,500) (54,000)    
Outstanding at the end of the period (in shares         2,787,228 3,027,203    
Weighted-Average Exercise Price Per Share                
Outstanding at the beginning of the period (in dollars per share)         $ 21.95 $ 21.95    
Forfeiture or expirations (in dollars per share)         21.95 21.95    
Outstanding at the end of the period (in dollars per share)         $ 21.95 $ 21.95