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Long-Term Obligations - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Sep. 29, 2014
Mar. 31, 2014
Mar. 27, 2014
May. 09, 2013
Debt Instrument                  
Loss on debt extinguishment $ 0 $ 0 $ 0 $ (324)          
Credit Agreement                  
Debt Instrument                  
Maximum credit agreement borrowings               $ 2,300,000  
Maximum increase of revolving credit facility or term loans               $ 400,000  
Maximum leverage ratio for incremental borrowings               2.50  
Term loan quarterly repayment, percentage of initial balance               1.25%  
Increment change in applicable margin               0.25%  
Weighted average interest rate 2.11%   2.11%   2.10%        
Increment change in commitment fees               0.05%  
Fronting fee on letters of credit in addition to participation commission               0.125%  
Current maturities of credit agreement $ 22,500   $ 22,500   $ 22,500        
Outstanding letters of credit 71,500   71,500            
Availability on the revolving credit facility 1,200,000   1,200,000            
Payments of financing costs         3,700        
Fees capitalized             $ 3,400    
Loss on debt extinguishment         300        
Credit Agreement | Multicurrency Component                  
Debt Instrument                  
Maximum revolving credit facility borrowings               $ 1,690,000  
Credit Agreement | US Dollar Component                  
Debt Instrument                  
Maximum revolving credit facility borrowings               165,000  
Term Loan                  
Debt Instrument                  
Term loans payable 421,875   421,875   433,125     $ 450,000  
Senior Notes                  
Debt Instrument                  
Senior notes $ 600,000   $ 600,000   600,000       $ 600,000
Senior notes interest rate                 4.75%
Receivables Securitization Facility                  
Debt Instrument                  
Weighted average interest rate 0.94%   0.94%            
Receivables securitization maximum borrowing capacity           $ 97,000      
Receivables used as collateral for receivables securitization facility $ 130,100   $ 130,100   129,500        
Borrowings under receivable securitization facility, carrying value $ 95,242   $ 95,242   $ 94,900