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Debt Senior Credit Facility (Details)
0 Months Ended 0 Months Ended
Sep. 30, 2014
USD ($)
Dec. 31, 2013
USD ($)
Sep. 30, 2014
Revolver
USD ($)
Sep. 30, 2014
Letter of Credit
USD ($)
Sep. 30, 2014
Additional Revolver
USD ($)
Sep. 30, 2014
Term Loan
USD ($)
Aug. 27, 2014
Term Loan
Credit Facility Term Loan [Member]
USD ($)
Aug. 27, 2014
Term Loan
London Interbank Offered Rate (LIBOR)
Aug. 27, 2014
Term Loan
London Interbank Offered Rate (LIBOR)
Minimum
Aug. 27, 2014
Australian LC Facility
Letter of Credit
AUD
Aug. 27, 2014
Revolver
Revolving Credit Facility [Member]
USD ($)
Aug. 27, 2014
Revolver
London Interbank Offered Rate (LIBOR)
Aug. 27, 2014
Credit Facility
USD ($)
Aug. 27, 2014
Credit Facility
USD ($)
Aug. 27, 2014
Credit Agreement
Line of Credit Facility [Line Items]                              
Face amount             $ 296,300,000                
Basis spread on variable rate               2.50% 0.75%     2.25%      
Maximum borrowing capacity                   225,000,000 700,000,000        
Amount outstanding on letters of credit                   214,000,000          
Write off of deferred debt issuance cost                         400,000    
Unamortized debt issuance expense                           3,100,000  
Total leverage ratio                             5.75
Senior secured leverage ratio                             3.50
Interest coverage ratio                             3.00
Term loan 296,250,000 298,500,000       296,250,000                  
Revolver 40,000,000 340,000,000 40,000,000                        
Long-term debt       61,000,000                      
Borrowing capacity increase         $ 599,000,000                    
Weighted average interest rate 3.20%