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Long-Term Debt (Details) (USD $)
In Thousands, unless otherwise specified
1 Months Ended 12 Months Ended
Apr. 30, 2012
Jun. 30, 2012
Apr. 13, 2012
Oct. 21, 2011
Line of Credit Facility [Line Items]        
Expiration date   October 21, 2016    
Swing line loan [Member]
       
Line of Credit Facility [Line Items]        
Maximum borrowing capacity       $ 25,000
Maximum aggregate available borrowing amounts       25,000
Senior unsecured revolving credit facility [Member]
       
Line of Credit Facility [Line Items]        
Current borrowing capacity     387,500 250,000
Maximum borrowing capacity   387,500    
Additional borrowings 137,500      
Increase to borrowing capacity in future periods     150,000  
Description of variable rate basis   LIBOR    
Weighted average interest rate   1.50%    
Interest coverage ratio   3.5    
Senior leverage ratio   2.75    
Ratio of earnings before interest, taxes, depreciation and amortization to interest expense   3.0    
Maximum aggregate available borrowing amounts   387,500    
Oustanding borrowings   (229,000)    
Stand-by letters of credit   (22,012)    
Maximum additional available borrowing amount   $ 136,488 [1]    
Senior unsecured revolving credit facility [Member] | Minimum [Member]
       
Line of Credit Facility [Line Items]        
Basis spread on LIBOR   1.25%    
Commitment fee (percentage)   0.175%    
Senior unsecured revolving credit facility [Member] | Maximum [Member]
       
Line of Credit Facility [Line Items]        
Basis spread on LIBOR   1.50%    
Commitment fee (percentage)   0.225%    
[1] We have other financial obligations, including installment obligations and letters of credit, that constitute additional indebtedness based on the definitions within the credit facility. This additional indebtedness, as well as our current leverage, can potentially decrease the available amounts under the credit facility.