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LONG-TERM OBLIGATIONS - General (Details)
1 Months Ended 12 Months Ended
Apr. 30, 2015
USD ($)
item
Jan. 26, 2015
Mar. 26, 2014
Nov. 30, 2014
Apr. 30, 2014
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Apr. 01, 2014
USD ($)
Aug. 27, 2013
USD ($)
LONG-TERM OBLIGATIONS                  
Unamortized debt issuance expense           $ (5,264,000) $ (5,703,000)    
Less: Obligations due within one year           12,213,000 10,959,000    
Long-term obligations           371,365,000 296,819,000    
Long-term obligations, principal           388,842,000 313,481,000    
Long-term unamortized debt issuance expense           (5,264,000) (5,703,000)    
Interest rate swap                  
LONG-TERM OBLIGATIONS                  
Changes in fair value of derivative included in accumulated other comprehensive income           1,400,000 2,500,000    
Fair value of the interest rate swap, liability           $ 3,900,000 2,500,000    
Minus - 10                  
LONG-TERM OBLIGATIONS                  
Fair value of contingent consideration               $ 933,000  
Contingent consideration liability, discount rate (as a percent)           25.00%      
Credit Agreement                  
LONG-TERM OBLIGATIONS                  
Aggregate amount of funds available           $ 475,000,000     $ 400,000,000
Increase in loan provided by uncommitted accordion                 200,000,000
Reduction in term loan interest rate (as a percent)     0.50%            
Net leverage ratio, maximum           4.50      
Mandatory prepayment leverage ratio, minimum           2.75      
Maximum percentage of net income that can be paid as dividends and repurchase securities           50.00%      
Mandatory prepayments outstanding           $ 0      
Senior secured term loan                  
LONG-TERM OBLIGATIONS                  
Unamortized debt issuance expense           (5,264,000) (5,703,000)    
Long-term obligations, principal           367,213,000 $ 296,250,000    
Principal amount of debt issued           375,000,000     300,000,000
Maximum borrowing capacity subject at the entity's option, subject to compliance with covenants                 500,000,000
Payments of the principal amount of debt quarterly $ 900,000                
Increase in borrowing capacity $ 75,000,000                
Number of quarterly repayments | item 21                
Senior secured term loan | Interest rate cap                  
LONG-TERM OBLIGATIONS                  
Term of derivative contract             2 years    
Notional amount             $ 150,000,000    
Strike rate (as a percent)             3.00%    
Ineffectiveness gain (loss) recognized in earnings           $ 0      
Senior secured term loan | Interest rate swap | Forward                  
LONG-TERM OBLIGATIONS                  
Notional amount         $ 73,700,000        
Strike rate (as a percent)         2.81%        
Basis spread on variable rate basis, floor         0.75%        
Senior secured term loan | Prime rate                  
LONG-TERM OBLIGATIONS                  
Basis points added to reference rate (as a percent)   2.75% 2.50%            
Variable interest rate basis   prime rate              
Interest rate, variable interest rate floor   1.75% 1.75%            
Senior secured term loan | LIBOR                  
LONG-TERM OBLIGATIONS                  
Basis points added to reference rate (as a percent)   3.75% 3.50%     3.75%      
Variable interest rate basis   one, two, three or six month LIBOR one, two, three or six month LIBOR     LIBOR      
Interest rate, variable interest rate floor   0.75% 0.75%     0.75%      
Aggregate floating rate (as a percent)   4.50% 4.25%     4.50%      
Senior secured revolving loan                  
LONG-TERM OBLIGATIONS                  
Aggregate amount of funds available           $ 100,000,000     100,000,000
Line of credit amount outstanding           0      
Maximum borrowing capacity subject at the entity's option, subject to compliance with covenants                 $ 200,000,000
Capital leases, due various dates from 2016 to 2021                  
LONG-TERM OBLIGATIONS                  
Long-term obligations, principal           $ 13,326,000 $ 3,177,000    
Weighted average interest rate (as a percent)           4.64%      
Notes payable, 2.20%, due 2017                  
LONG-TERM OBLIGATIONS                  
Long-term obligations, principal           $ 8,303,000 12,895,000    
Interest rate bearing notes payable (as a percent)       2.20%          
Acquisition-related liabilities                  
LONG-TERM OBLIGATIONS                  
Total obligations             1,159,000    
Long-term obligations, principal             1,159,000    
Contingent consideration | Minus - 10                  
LONG-TERM OBLIGATIONS                  
Less: Obligations due within one year             1,116,000    
Deferred acquisition price | Minus - 10                  
LONG-TERM OBLIGATIONS                  
Total obligations             $ 43,000    
Letters of credit                  
LONG-TERM OBLIGATIONS                  
Letters of credit amount outstanding           $ 800,000