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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
3 Months Ended 9 Months Ended 12 Months Ended
Aug. 04, 2017
Feb. 26, 2016
Jun. 29, 2015
May 20, 2015
Feb. 09, 2015
Jan. 23, 2013
Sep. 30, 2018
Sep. 30, 2018
Dec. 31, 2014
Dec. 31, 2012
Dec. 31, 2011
Stock-based compensation                      
Granted (in shares)               0      
Exercised (in shares)               10,000      
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          
Exercised (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