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STOCK-BASED COMPENSATION - Non-Qualified Stock Option Awards Granted (Details) - Stock Option Awards - Amended and Restated 2010 Equity Incentive Plan - $ / shares
6 Months Ended 12 Months Ended
Aug. 04, 2017
Feb. 26, 2016
Jun. 29, 2015
May 20, 2015
Feb. 09, 2015
Jan. 23, 2013
Jun. 30, 2018
Dec. 31, 2014
Dec. 31, 2012
Dec. 31, 2011
Stock-based compensation                    
Granted (in shares)             0      
Exercised (in shares)             0      
Albright, Patten, and Smith                    
Stock-based compensation                    
Granted (in shares)               10,000 10,000 50,000
Vesting per year (as a percent)               33.33% 33.33% 33.33%
Period of expiration from grant date               10 years 10 years 10 years
Period of expiration after death or termination for disability               12 months 12 months 12 months
Period of expiration after termination of employment for reason other than death or disability               30 days 30 days 30 days
Certain employees                    
Stock-based compensation                    
Granted (in shares)           51,000        
Vesting per year (as a percent)           33.00%        
Period of expiration from grant date           5 years        
Period of expiration after death or termination for disability           12 months        
Period of expiration after termination of employment for reason other than death or disability           30 days        
Mr. Patten                    
Stock-based compensation                    
Granted (in shares)           10,000        
Mr. Albright                    
Stock-based compensation                    
Granted (in shares)   40,000   40,000 20,000          
Period of expiration after death or termination for disability   12 months     12 months          
Period of expiration after termination of employment for reason other than death or disability   30 days     30 days          
Exercise price (in dollars per share)       $ 55.62 $ 57.50          
Surrendered (in shares)   40,000                
Mr. Albright | Immediate vesting                    
Stock-based compensation                    
Vesting percentage   33.00%                
Mr. Albright | Vesting on designated anniversary dates                    
Stock-based compensation                    
Vesting percentage   67.00%                
Officer                    
Stock-based compensation                    
Granted (in shares)     10,000              
Vesting per year (as a percent)     33.00%              
Period of expiration after death or termination for disability     12 months              
Period of expiration after termination of employment for reason other than death or disability     30 days              
Exercise price (in dollars per share)     $ 57.54              
Equity Award Agreements                    
Award agreements                    
Period after change of control for equity award to fully vest upon termination of employment without cause or resignation 24 months