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NOTES PAYABLE, REVOLVING CREDIT FACILITY AND CAPITAL LEASES - Narrative (Details)
1 Months Ended 12 Months Ended 35 Months Ended
Aug. 31, 2018
USD ($)
Aug. 22, 2017
USD ($)
Feb. 02, 2017
USD ($)
Jul. 01, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2017
Dec. 31, 2018
USD ($)
Aug. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]                  
Deferred financing costs, net of accumulated amortization             $ 1,400,000   $ 1,900,000
Debt instrument, leverage ratio   4.00              
Amendment No. 4 First Lien Credit Agreement | Eurodollar                  
Debt Instrument [Line Items]                  
Basis spread on variable rate     3.25%            
First Lien Term Loans | Eurodollar                  
Debt Instrument [Line Items]                  
Basis spread on variable rate       3.75%          
Basis spread, increase (decrease)       50.00%          
Restated Agreement                  
Debt Instrument [Line Items]                  
Credit facilities, increase (decrease)               $ 48,100,000  
Agreement                  
Debt Instrument [Line Items]                  
Credit facilities available         $ 50,000,000.0        
Term Loan                  
Debt Instrument [Line Items]                  
Total Carrying Value             631,329,000    
Debt, unamortized discount             15,112,000    
Face Value             646,441,000    
Term Loan | First Lien Credit Agreement                  
Debt Instrument [Line Items]                  
Debt periodic payment             6,100,000    
Term Loan | Amendment No. 5 First Lien Credit Agreement                  
Debt Instrument [Line Items]                  
Debt instrument, increase to credit facility, maximum   $ 100,000,000.0              
Term Loan | First Lien Term Loans                  
Debt Instrument [Line Items]                  
Total Carrying Value             572,079,000    
Debt, unamortized discount             15,112,000    
Debt discount             15,112,000   $ 18,470,000
Face Value       $ 485,000,000     587,191,000    
Term Loan | First Lien Term Loans | Eurodollar                  
Debt Instrument [Line Items]                  
Basis spread on variable rate       3.75%          
Basis spread, floor       1.00%          
Term Loan | First Lien Term Loans | Base Rate                  
Debt Instrument [Line Items]                  
Basis spread on variable rate       2.75%          
Term Loan | Second Lien Term Loans                  
Debt Instrument [Line Items]                  
Face Value             180,000,000    
Principal payment       $ 12,000,000          
General corporate expense       10,000,000          
Term Loan | Restated Agreement                  
Debt Instrument [Line Items]                  
Credit facilities available $ 60,000,000.0             60,000,000.0  
Total Carrying Value             59,250,000    
Debt, unamortized discount             0    
Face Value             $ 59,250,000    
Debt periodic payment $ 750,000                
Credit facilities, increase (decrease)               28,100,000  
Debt periodic payment, percent of total amount 5.00%                
Debt periodic payment, amortization increase $ 375,000             375,000  
Term Loan | Agreement                  
Debt Instrument [Line Items]                  
Credit facilities available 40,000,000.0             40,000,000.0  
Debt periodic payment $ 500,000                
Debt periodic payment, percent of total amount 5.00%                
Debt periodic payment, amortization increase $ 250,000             250,000  
Revolving Credit Facility | Line of Credit | First Lien Credit Agreement                  
Debt Instrument [Line Items]                  
Credit facilities available       $ 117,500,000.0          
Fronting fee       0.25%          
Commitment fee       0.50%          
Interest rate at end of period             8.25%    
Credit facility, borrowings available             $ 83,200,000    
Revolving Credit Facility | Line of Credit | First Lien Credit Agreement | Eurodollar | ≤ 3.50x                  
Debt Instrument [Line Items]                  
Basis spread on variable rate       3.25%          
Revolving Credit Facility | Line of Credit | First Lien Credit Agreement | Eurodollar | 4.00x but ≤ 5.50x                  
Debt Instrument [Line Items]                  
Basis spread on variable rate       3.75%          
Revolving Credit Facility | Line of Credit | First Lien Credit Agreement | Base Rate | ≤ 3.50x                  
Debt Instrument [Line Items]                  
Basis spread on variable rate       2.25%          
Revolving Credit Facility | Line of Credit | First Lien Credit Agreement | Base Rate | 4.00x but ≤ 5.50x                  
Debt Instrument [Line Items]                  
Basis spread on variable rate       2.75%          
Revolving Credit Facility | Line of Credit | Amendment No. 5 First Lien Credit Agreement                  
Debt Instrument [Line Items]                  
Credit facilities available             $ 170,000,000.0    
Periodic payment, principal   8,300,000              
Issuance costs   4,700,000              
Debt discount   4,100,000              
Deferred financing costs   350,000              
Debt issuance expense   $ 235,000              
Revolving Credit Facility | Line of Credit | Amendment No. 5 First Lien Credit Agreement | Eurodollar                  
Debt Instrument [Line Items]                  
Basis spread on variable rate             3.75%    
Effective interest rate             2.44%    
Revolving Credit Facility | Line of Credit | Amendment No. 5 First Lien Credit Agreement | Eurodollar | ≤ 3.50x                  
Debt Instrument [Line Items]                  
Basis spread on variable rate   3.25%       3.25%      
Revolving Credit Facility | Line of Credit | Amendment No. 5 First Lien Credit Agreement | Eurodollar | 4.00x but ≤ 5.50x                  
Debt Instrument [Line Items]                  
Basis spread on variable rate   3.75%       3.75%      
Revolving Credit Facility | Line of Credit | Amendment No. 5 First Lien Credit Agreement | Base Rate                  
Debt Instrument [Line Items]                  
Basis spread on variable rate             2.75%    
Effective interest rate             5.50%    
Revolving Credit Facility | Line of Credit | Amendment No. 5 First Lien Credit Agreement | Base Rate | ≤ 3.50x                  
Debt Instrument [Line Items]                  
Basis spread on variable rate   2.25%       2.25%      
Revolving Credit Facility | Line of Credit | Amendment No. 5 First Lien Credit Agreement | Base Rate | 4.00x but ≤ 5.50x                  
Debt Instrument [Line Items]                  
Basis spread on variable rate   2.75%       2.75%      
Revolving Credit Facility | Line of Credit | Amendment No. 4 First Lien Credit Agreement                  
Debt Instrument [Line Items]                  
Periodic payment, principal     $ 6,100,000            
Debt discount             $ 543,000    
Revolving Credit Facility | Line of Credit | Restated Agreement                  
Debt Instrument [Line Items]                  
Credit facilities available $ 30,000,000.0             30,000,000.0  
Fronting fee 2.75%                
Commitment fee 0.45%                
Credit facilities, increase (decrease)               $ 20,000,000.0  
Revolving Credit Facility | Line of Credit | Restated Agreement | Eurodollar                  
Debt Instrument [Line Items]                  
Basis spread on variable rate 2.75%                
Revolving Credit Facility | Line of Credit | Restated Agreement | Eurodollar | Maximum                  
Debt Instrument [Line Items]                  
Basis spread on variable rate 2.75%                
Revolving Credit Facility | Line of Credit | Restated Agreement | Eurodollar | Minimum                  
Debt Instrument [Line Items]                  
Basis spread on variable rate 1.50%                
Revolving Credit Facility | Line of Credit | Restated Agreement | Base Rate                  
Debt Instrument [Line Items]                  
Basis spread on variable rate 1.75%                
Revolving Credit Facility | Line of Credit | Restated Agreement | Base Rate | Maximum                  
Debt Instrument [Line Items]                  
Basis spread on variable rate 1.75%                
Revolving Credit Facility | Line of Credit | Restated Agreement | Base Rate | Minimum                  
Debt Instrument [Line Items]                  
Basis spread on variable rate 0.50%                
Revolving Credit Facility | Line of Credit | Agreement                  
Debt Instrument [Line Items]                  
Credit facilities available         $ 10,000,000.0        
Fronting fee         3.00%        
Commitment fee         0.45%        
Revolving Credit Facility | Line of Credit | Agreement | Eurodollar                  
Debt Instrument [Line Items]                  
Basis spread on variable rate         3.00%        
Revolving Credit Facility | Line of Credit | Agreement | Eurodollar | Maximum                  
Debt Instrument [Line Items]                  
Basis spread on variable rate         3.00%        
Revolving Credit Facility | Line of Credit | Agreement | Eurodollar | Minimum                  
Debt Instrument [Line Items]                  
Basis spread on variable rate         1.75%        
Revolving Credit Facility | Line of Credit | Agreement | Base Rate                  
Debt Instrument [Line Items]                  
Basis spread on variable rate         2.00%        
Revolving Credit Facility | Line of Credit | Agreement | Base Rate | Maximum                  
Debt Instrument [Line Items]                  
Basis spread on variable rate         2.00%        
Revolving Credit Facility | Line of Credit | Agreement | Base Rate | Minimum                  
Debt Instrument [Line Items]                  
Basis spread on variable rate         0.75%        
Revolving Credit Facility | Line of Credit | Barclays                  
Debt Instrument [Line Items]                  
Deferred financing costs, net of accumulated amortization             1,400,000    
Revolving Credit Facility | Line of Credit | Barclays | First Lien Credit Agreement                  
Debt Instrument [Line Items]                  
Credit facilities available             117,500,000    
Total credit facilities outstanding             28,000,000    
Revolving Credit Facility | Line of Credit | SunTrust                  
Debt Instrument [Line Items]                  
Credit facilities available             $ 30,000,000