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Debt (Details Textual) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Jun. 30, 2012
Apr. 30, 2012
Debt (Textual) [Abstract]      
Date of maturity April 27 2016    
Debt (Additional Textual) [Abstract]      
Senior secured term loan, outstanding amount (Jan 2016)     $ 198,700
Issuance of letters of credit 10,000    
Provisions in future incremental borrowings 150,000    
Minimum percentage of senior secured term loan for interest rate protection 25.00%    
Maximum [Member]
     
Debt (Textual) [Abstract]      
Leverage ratio 2.75    
Minimum [Member]
     
Debt (Textual) [Abstract]      
Leverage ratio 1.00    
Default in payment of principal 10,000    
7.375% Senior secured notes [Member]
     
Debt (Textual) [Abstract]      
Senior secured notes, aggregate principal amount issued     210,000
Interest rate   7.375% 7.375%
Debt issuance costs 8,600    
Percentage of principal amount, redemption price 107.375%    
Repurchase of Senior Secured Notes Purchase Price Percentage 101.00%    
Senior Secured notes due date May 15, 2019    
7.375% Senior secured notes [Member] | Maximum [Member]
     
Debt (Textual) [Abstract]      
Percentage of aggregate principal amount, maximum redeemable 35.00%    
Percentage of principal amount redeemed at redemption date 105.53%    
7.375% Senior secured notes [Member] | Minimum [Member]
     
Debt (Textual) [Abstract]      
Minimum percentage of aggregate principal amount outstanding, excluding the redemption date 65.00%    
Percentage of principal amount redeemed at redemption date 100.00%    
Senior secured term loan [Member]
     
Debt (Textual) [Abstract]      
Date of maturity 2016-01    
Secured term loan facility [Member]
     
Debt (Textual) [Abstract]      
Senior secured notes, aggregate principal amount issued     265,000
Revolving credit facility [Member]
     
Debt (Textual) [Abstract]      
Maximum borrowing capacity 30,000   25,000
Date of maturity January 2013    
Outstanding balance on the revolving credit facility $ 0    
Interest rate option, LIBOR based [Member] | Revolving credit facility [Member]
     
Debt (Textual) [Abstract]      
Interest rate 1.00%    
Interest rate description LIBOR (subject to a 1.00% floor) plus a margin of 4.50%,    
Interest rate, margin added 4.50%    
Commitment fees on unused portion of facility 0.50%    
Interest rate option, Base Rate based [Member] | Revolving credit facility [Member]
     
Debt (Textual) [Abstract]      
Interest rate 2.00%    
Interest rate description Base Rate (subject to a 2.00% floor) plus a margin 3.50%    
Interest rate, margin added 3.50%