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STOCK-BASED COMPENSATION - Market Condition Restricted Shares, Stock Price Vesting (Details) - Restricted Shares
3 Months Ended 6 Months Ended 12 Months Ended 24 Months Ended
Feb. 26, 2016
item
$ / shares
shares
Mar. 31, 2017
USD ($)
item
$ / shares
shares
Jun. 30, 2015
item
$ / shares
shares
Mar. 31, 2015
shares
Dec. 31, 2014
shares
Mar. 31, 2015
item
$ / shares
Dec. 31, 2012
shares
Dec. 31, 2011
shares
Dec. 31, 2012
item
$ / shares
Stock-based compensation                  
Vesting period of performance shares after change of control 24 months                
Market Condition Restricted Shares - Stock Price Vesting                  
Stock-based compensation                  
Number of increments to vest | item                 6
Restricted share award period after termination of employment                 60 days
Period for average closing price                 60 days
Restricted share award closing prices range per share, Minimum | $ / shares                 $ 36
Restricted share award closing prices range per share, Maximum | $ / shares                 $ 65
Period subject to stock price condition                 6 years
Market Condition Restricted Shares - Stock Price Vesting | Mr. Albright                  
Share-based Compensation, Other Than Options, Shares                  
Granted (in shares)               96,000  
Market Condition Restricted Shares - Stock Price Vesting | 2010 Plan                  
Stock-based compensation                  
Number of increments to vest | item           2      
Restricted share award period after termination of employment           60 days      
Period for average closing price           60 days      
Restricted share award closing prices range per share, Minimum | $ / shares           $ 60      
Restricted share award closing prices range per share, Maximum | $ / shares           $ 65      
Period subject to stock price condition           6 years      
Share-based Compensation, Other Than Options, Shares                  
Outstanding (in shares)   69,500              
Granted (in shares)                
Outstanding (in shares)   69,500              
Share-based Compensation, Other Than Options, Weighted Average Fair Value                  
Stock based compensation, Weighted Average Fair Value Per Share, beginning balance | $ / shares   $ 27.03              
Stock based compensation, Weighted Average Fair Value Per Share, Granted | $ / shares                
Stock based compensation, Weighted Average Fair Value Per Share, ending balance | $ / shares   $ 27.03              
Unrecognized compensation cost related to market condition non-vested restricted shares | $   $ 0              
Market Condition Restricted Shares - Stock Price Vesting | 2010 Plan | Mr. Albright                  
Stock-based compensation                  
Number of increments to vest | item 4   4            
Restricted share award period after termination of employment 60 days   60 days            
Period for average closing price 30 days   30 days            
Restricted share award closing prices range per share, Minimum | $ / shares $ 60   $ 60            
Restricted share award closing prices range per share, Maximum | $ / shares $ 75   $ 75            
Number of increments vested | item   0              
Stock based compensation, shares, surrendered 72,000                
Stock based compensation, shares, permanently surrendered 68,000                
Share-based Compensation, Other Than Options, Shares                  
Granted (in shares) 4,000   94,000            
Outstanding (in shares) 26,000                
Market Condition Restricted Shares - Stock Price Vesting | 2010 Plan | Mr. Patten                  
Share-based Compensation, Other Than Options, Shares                  
Granted (in shares)             17,000    
Market Condition Restricted Shares - Stock Price Vesting | 2010 Plan | Mr. Albright and Mr. Patten                  
Stock-based compensation                  
Number of increments vested | item   4              
Market Condition Restricted Shares - Stock Price Vesting | 2010 Plan | Mr. Smith                  
Share-based Compensation, Other Than Options, Shares                  
Granted (in shares)         2,500        
Market Condition Restricted Shares - Stock Price Vesting | 2010 Plan | Officer                  
Share-based Compensation, Other Than Options, Shares                  
Granted (in shares)       3,000          
Market Condition Restricted Shares - Stock Price Vesting | 2010 Plan | Mr. Smith and other Officer                  
Stock-based compensation                  
Number of increments vested | item   0