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LONG-TERM DEBT (Details)
3 Months Ended 6 Months Ended
Jul. 20, 2016
USD ($)
Dec. 31, 2015
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Sep. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Sep. 30, 2014
USD ($)
Jun. 30, 2014
USD ($)
Mar. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Sep. 30, 2013
USD ($)
Jun. 30, 2013
USD ($)
Nov. 15, 2011
USD ($)
Long-term debt                              
Current portion of long-term debt   $ 40,900,000                          
Amounts outstanding under the credit facility       $ 35,000,000                      
Amended Credit Facility                              
Long-term debt                              
Maximum borrowing capacity $ 250,000,000                            
Amount to which the maximum borrowing capacity will be reduced 50,000,000                            
Amount of outstanding revolving loans that will be converted to term loans $ 200,000,000                            
Amended Credit Facility | Base Rate                              
Long-term debt                              
Variable interest rate base Base Rate                            
Amended Credit Facility | LIBOR                              
Long-term debt                              
Variable interest rate base LIBOR                            
Amended Credit Facility | Minimum | Base Rate                              
Long-term debt                              
Percentage points added to the reference rate 0.00%                            
Amended Credit Facility | Minimum | LIBOR                              
Long-term debt                              
Percentage points added to the reference rate 1.00%                            
Amended Credit Facility | Maximum | Base Rate                              
Long-term debt                              
Percentage points added to the reference rate 1.50%                            
Amended Credit Facility | Maximum | LIBOR                              
Long-term debt                              
Percentage points added to the reference rate 2.50%                            
Credit Facility                              
Long-term debt                              
Maximum borrowing capacity       45,500,000                     $ 100,000,000
Amount in which the maximum borrowing capacity was permanently reduced   15,000,000 $ 20,000,000                        
Reduction in maximum borrowing capacity each quarter   $ 1,500,000 $ 1,500,000 1,500,000 $ 1,500,000 $ 1,500,000 $ 1,500,000 $ 1,500,000 $ 1,500,000 $ 1,500,000 $ 1,500,000 $ 1,500,000 $ 1,500,000 $ 1,500,000  
Multiple which may be used to permanently reduce the maximum borrowing capacity under the credit facility       $ 50,000                      
Percentage points added to the reference rate       1.25%                      
One-month LIBOR interest rate (as a percent)       0.47%                      
Credit Facility | Long-term liabilities                              
Long-term debt                              
Amounts outstanding under the credit facility       $ 35,000,000                      
Credit Facility | Actual                              
Long-term debt                              
Leverage ratio       0.7                      
Fixed charge coverage ratio       41.80                      
Credit Facility | LIBOR                              
Long-term debt                              
Variable interest rate base       LIBOR                      
Credit Facility | Minimum                              
Long-term debt                              
Amount in which the maximum borrowing capacity was permanently reduced       $ 500,000                      
Credit Facility | Minimum | Requirement                              
Long-term debt                              
Fixed charge coverage ratio       1.15                      
Credit Facility | Maximum | Requirement                              
Long-term debt                              
Leverage ratio       2.0                      
Original Credit Facility                              
Long-term debt                              
Maximum borrowing capacity                             $ 60,000,000