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Long-Term Debt (Details)
3 Months Ended
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Long-term debt      
Term Loan, net of debt discount $ 186,065,000 $ 186,472,000  
Less current maturities 1,629,000 1,629,000  
Long-term Debt, Excluding Current Maturities, Total 182,214,000 182,506,000  
Deferred financing costs, net 2,222,000 2,337,000  
Total long-term debt 182,214,000 182,506,000  
Term loan facility      
Long-term debt      
Less current maturities 1,629,000 1,629,000  
Long-term Debt, Excluding Current Maturities, Total 184,436,000 184,843,000  
Long-term debt, additional disclosure      
Unamortized discount on issuance of debt 1,561,000 1,629,000 $ 1,900,000
Revolving credit facility | Maximum      
Long-term debt, additional disclosure      
Facilities consolidation expenditure allowed 15,000,000    
Senior credit facilities      
Long-term debt, additional disclosure      
Maximum borrowing capacity 10,000,000    
Senior credit facilities | Term loan facility      
Long-term debt, additional disclosure      
Borrowings under senior credit facility $ 190,000,000    
Percentage of net cash proceeds of certain asset sales, certain insurance or condemnation events, requirement for additional principal prepayments 100.00%    
Period before end of the fiscal year, for additional principal prepayments of debt, from excess cash flow 150 days    
Percentage of excess cash flow paid as additional principal prepayments 50.00%    
Reduced percentage of excess cash flow paid as additional principal prepayments upon achievement of certain leverage ratio thresholds, one 0.00%    
Senior credit facilities | Term loan facility | Maximum      
Long-term debt, additional disclosure      
Additional term loan commitments $ 80,000,000    
Debt ratio 3.25    
Senior credit facilities | Term loan facility | First option | Minimum      
Long-term debt, additional disclosure      
Additional fixed interest rate spread (as a percent) 1.00%    
Additional interest margin added to fixed and variable rates (as a percent) 1.00%    
Senior credit facilities | Term loan facility | First option | Base rate      
Long-term debt, additional disclosure      
Fixed interest rate base (as a percent) 3.25%    
Senior credit facilities | Term loan facility | First option | Federal funds      
Long-term debt, additional disclosure      
Variable rate basis description Federal funds    
Interest rate added to variable rate (as a percent) 0.50%    
Senior credit facilities | Term loan facility | First option | One month London Interbank Offered Rate      
Long-term debt, additional disclosure      
Variable rate basis description LIBOR for a one month interest period    
Senior credit facilities | Term loan facility | First option | Prime      
Long-term debt, additional disclosure      
Variable rate basis description Prime Rate    
Senior credit facilities | Term loan facility | Second option | Minimum      
Long-term debt, additional disclosure      
Additional fixed interest rate spread (as a percent) 1.00%    
Senior credit facilities | Term loan facility | Second option | Base rate      
Long-term debt, additional disclosure      
Fixed interest rate base (as a percent) 4.25%    
Senior credit facilities | Revolving credit facility      
Long-term debt, additional disclosure      
Borrowings under senior credit facility $ 100,000,000    
Outstanding borrowings   $ 0  
Remaining borrowing availability $ 97,776,000    
Fixed charge coverage ratio to be maintained if certain minimum availability under the credit facility is not maintained. 1.0    
Senior credit facilities | Revolving credit facility | Maximum      
Long-term debt, additional disclosure      
Annual acquisitions allowed $ 12,500,000    
Senior credit facilities | Revolving credit facility | Fixed rate | Maximum      
Long-term debt, additional disclosure      
Fixed interest rate base (as a percent) 2.00%    
Senior credit facilities | Revolving credit facility | First option | Fixed rate | Minimum      
Long-term debt, additional disclosure      
Fixed interest rate base (as a percent) 1.50%    
Senior credit facilities | Revolving credit facility | Second option | Federal funds      
Long-term debt, additional disclosure      
Variable rate basis description Federal funds    
Interest rate added to variable rate (as a percent) 0.50%    
Senior credit facilities | Revolving credit facility | Second option | Fixed rate | Maximum      
Long-term debt, additional disclosure      
Fixed interest rate base (as a percent) 1.00%    
Senior credit facilities | Revolving credit facility | Second option | Fixed rate | Minimum      
Long-term debt, additional disclosure      
Fixed interest rate base (as a percent) 0.50%    
Senior credit facilities | Revolving credit facility | Second option | One month London Interbank Offered Rate      
Long-term debt, additional disclosure      
Variable rate basis description LIBOR for a one month interest period    
Interest rate added to variable rate (as a percent) 1.00%    
Senior credit facilities | Revolving credit facility | Second option | Prime      
Long-term debt, additional disclosure      
Variable rate basis description Prime Rate    
Revolving credit facility      
Long-term debt, additional disclosure      
Outstanding borrowings $ 0    
Swingline Loan [Member]      
Long-term debt, additional disclosure      
Maximum borrowing capacity $ 5,000,000