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Debt (Details Textual) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Debt (Textual) [Abstract]          
Loss on extinguishment of debt       $ (4,961)     
Debt (Additional Textual) [Abstract]          
Unamortized discount on term loan 470   470   1,306
Minimum [Member]
         
Debt (Textual) [Abstract]          
Aggregate percentage required for trustee or holder to declare debt due upon default     25.00%    
Default in payment of principal 10,000   10,000    
7.375% Senior Secured Notes due May 15, 2019 [Member]
         
Debt (Textual) [Abstract]          
Loss on extinguishment of debt 4,961   4,961    
Debt issuance costs     8,600    
Date of maturity     15 May 2019    
Percentage of aggregate principal amount, maximum redeemable     35.00%    
Calculated percentage for redemption price before May 15, 2015     107.375%    
Redemption price percentage upon change of control     101.00%    
Interest rate 7.375%   7.375%    
Stated principal amount at time of issuance 210,000   210,000    
7.375% Senior Secured Notes due May 15, 2019 [Member] | Maximum [Member]
         
Debt (Textual) [Abstract]          
Calculated percentages for redemption price after May 15, 2015     105.53%    
7.375% Senior Secured Notes due May 15, 2019 [Member] | Minimum [Member]
         
Debt (Textual) [Abstract]          
Percentage of aggregate principal amount required to be outstanding immediately following redemption     65.00%    
Calculated percentages for redemption price after May 15, 2015     100.00%    
Secured term loan facility [Member]
         
Debt (Textual) [Abstract]          
Outstanding balance of term loan at time of extinguishment 198,700   198,700    
Date of maturity     January 2016    
Stated principal amount at time of issuance 265,000   265,000    
Secured term loan facility [Member] | Maximum [Member]
         
Debt (Textual) [Abstract]          
Required leverage ratio upon credit facility draw 275.00%   275.00%    
Secured term loan facility [Member] | Minimum [Member]
         
Debt (Textual) [Abstract]          
Required leverage ratio upon credit facility draw 100.00%   100.00%    
Revolving credit facility [Member]
         
Debt (Textual) [Abstract]          
Outstanding balance on the revolving credit facility 198,700   198,700    
Maximum borrowing capacity 25,000   25,000    
Date of maturity     27 April 2016    
Revolving credit facility [Member] | Maximum [Member]
         
Debt (Textual) [Abstract]          
Amount of potential future incremental borrowings 150,000   150,000    
Revolving credit facility [Member] | Minimum [Member]
         
Debt (Textual) [Abstract]          
Aggregate amount of indebtedness that could result in default 10,000   10,000    
Terminated revolving credit facility [Member]
         
Debt (Textual) [Abstract]          
Maximum borrowing capacity $ 30,000   $ 30,000    
Date of maturity     January 2013    
Interest rate option, LIBOR based [Member] | Revolving credit facility [Member]
         
Debt (Textual) [Abstract]          
Interest rate description     LIBOR (subject to a 1.00% floor) plus a margin of 4.50%,    
Interest rate 1.00%   1.00%    
Interest rate, margin added 4.50%   4.50%    
Commitment fees on unused portion of the facility     0.50%    
Interest rate option, Base Rate based [Member] | Revolving credit facility [Member]
         
Debt (Textual) [Abstract]          
Interest rate description     Base Rate (subject to a 2.00% floor) plus a margin 3.50%    
Interest rate 2.00%   2.00%    
Interest rate, margin added 3.50%   3.50%