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LONG TERM DEBT (Details)
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Feb. 09, 2016
Sep. 30, 2015
Sep. 30, 2014
USD ($)
Sep. 30, 2013
USD ($)
Jun. 17, 2013
USD ($)
Jun. 30, 2013
USD ($)
Jun. 30, 2013
USD ($)
Sep. 30, 2013
USD ($)
Dec. 31, 2014
USD ($)
item
Dec. 31, 2013
USD ($)
Aug. 01, 2016
USD ($)
Jun. 30, 2014
USD ($)
Mar. 31, 2014
USD ($)
Jun. 16, 2013
USD ($)
Mar. 31, 2013
USD ($)
Long-Term Debt                                  
Debt before unamortized discount                     $ 530,292,000 $ 488,485,000          
Unamortized discount                     (1,308,000) (939,000)          
Total Debt                     528,984,000 487,546,000          
Current portion of long-term debt         $ 25,677,000 $ 15,437,000   $ 15,652,000 $ 15,652,000 $ 15,437,000 26,852,000 17,728,000   $ 24,505,000 $ 21,906,000   $ 13,229,000
Long-term debt, less current portion         $ 511,698,000 $ 474,068,000   505,751,000 505,751,000 474,068,000 502,132,000 469,818,000   $ 535,093,000 $ 559,096,000   $ 522,189,000
Write-off of debt issuance costs               $ (6,645,000) $ (6,645,000) (6,645,000)   (6,645,000)          
Aggregate contractual payments associated with the financing obligations                                  
2015                     3,059,000            
2016                     3,041,000            
2017                     4,290,000            
2018                     3,281,000            
2019                     4,891,000            
Thereafter                     21,107,000            
Total                     39,669,000            
Standby letters of credit                                  
Long-Term Debt                                  
Letters of credit outstanding amount                     $ 3,600,000 3,600,000          
New credit agreement                                  
Long-Term Debt                                  
Term of agreement             5 years                    
Maximum borrowing capacity             $ 425,000,000                    
Year-end interest rate                     2.17%            
Number of covenants not evaluated | item                     2            
New credit agreement | Minimum                                  
Long-Term Debt                                  
Consolidated interest coverage ratio                     3.50            
New credit agreement | Maximum                                  
Long-Term Debt                                  
Leverage ratio                     4.00            
New credit agreement | LIBOR                                  
Long-Term Debt                                  
Year-end interest rate                     0.17%            
Interest rate margin (as a percent)     2.00%               2.00%            
New credit agreement | Term Loan                                  
Long-Term Debt                                  
Debt before unamortized discount                     $ 213,750,000 222,188,000          
Maximum borrowing capacity             225,000,000                    
Quarterly principal payments, as a percent to initial amount borrowed 3.75% 2.50%   1.875% 1.25% 0.625%                      
Initial amount borrowed           $ 225,000,000       $ 225,000,000 143,400,000            
Mandatory prepayment                     0 0          
New credit agreement | Revolving Credit Facility                                  
Long-Term Debt                                  
Debt before unamortized discount                     70,000,000 25,000,000          
Maximum borrowing capacity             $ 200,000,000                    
Available credit facility                     126,400,000 171,400,000          
Unused commitment fee (as a percent)                     0.375            
Previous credit agreement                                  
Long-Term Debt                                  
Maximum borrowing capacity                               $ 400,000,000  
Term B Credit Agreement                                  
Long-Term Debt                                  
Interest rate stated percentage                         11.50%        
Maximum borrowing capacity                         $ 280,000,000        
Senior Notes due 2018                                  
Long-Term Debt                                  
Debt before unamortized discount                     $ 200,000,000 $ 200,000,000          
Interest rate stated percentage                     7.125% 7.125%          
Senior Notes due 2018 | Subsequent to November 15, 2014                                  
Long-Term Debt                                  
Redemption period, start date                     Nov. 16, 2014            
Redemption period, end date                     Nov. 14, 2015            
Redemption premium (as a percent)                     103.60%            
Senior Notes due 2018 | On or after November 15, 2015                                  
Long-Term Debt                                  
Redemption period, start date                     Nov. 15, 2015            
Redemption period, end date                     Nov. 15, 2016            
Redemption premium (as a percent)                     101.80%            
Sellers notes                                  
Long-Term Debt                                  
Debt before unamortized discount                     $ 26,624,000 $ 21,072,000          
Unamortized discount                     $ (1,300,000) (900,000)          
Effective interest rate, minimum                     2.00%            
Effective interest rate, maximum                     4.00%            
Effective interest rate                     6.50%            
Financing obligations and other                                  
Long-Term Debt                                  
Debt before unamortized discount                     $ 19,918,000 $ 20,225,000          
Financing obligations and other | Leased building | Minimum                                  
Long-Term Debt                                  
Effective interest rate                     13.00%            
Lease commitment terms                     1 year            
Financing obligations and other | Leased building | Maximum                                  
Long-Term Debt                                  
Lease commitment terms                     20 years            
Credit Agreement and Senior Notes | Minimum                                  
Long-Term Debt                                  
Subsidiary guarantors' percentage of revenue                     90.00%            
Subsidiary guarantors' percentage of assets                     90.00%