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Debt (Details Textual) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2010
Apr. 30, 2012
Dec. 31, 2011
Dec. 31, 2012
Maximum [Member]
Dec. 31, 2012
Minimum [Member]
Dec. 31, 2012
7.375% Senior secured notes [Member]
Jun. 30, 2012
7.375% Senior secured notes [Member]
Apr. 30, 2012
7.375% Senior secured notes [Member]
Dec. 31, 2012
7.375% Senior secured notes [Member]
Maximum [Member]
Dec. 31, 2012
7.375% Senior secured notes [Member]
Minimum [Member]
Dec. 31, 2012
Secured term loan facility [Member]
Apr. 30, 2012
Secured term loan facility [Member]
Dec. 31, 2012
Revolving credit facility [Member]
Apr. 30, 2012
Revolving credit facility [Member]
Dec. 31, 2012
Interest rate option, LIBOR based [Member]
Revolving credit facility [Member]
Dec. 31, 2012
Interest rate option, Base Rate based [Member]
Revolving credit facility [Member]
Debt (Textual) [Abstract]                                  
Stated principal amount at time of issuance                 $ 210,000       $ 265,000        
Interest rate               7.375% 7.375%             1.00% 2.00%
Loss on extinguishment of debt 4,961 2,573         4,961                    
Debt issuance costs             8,600                    
Percentage of aggregate principal amount, maximum redeemable                   35.00%              
Percentage of principal amount, redemption price             107.375%                    
Minimum percentage of aggregate principal amount outstanding, excluding the redemption date                     65.00%            
Percentage of principal amount redeemed at redemption date                   105.53% 100.00%            
Repurchase of Senior Secured Notes Purchase Price Percentage             101.00%                    
Interest rate description                               LIBOR (subject to a 1.00% floor) plus a margin of 4.50%, Base Rate (subject to a 2.00% floor) plus a margin 3.50%
Maximum borrowing capacity                           30,000 25,000    
Date of maturity April 27 2016                     January 2016   January 2013      
Interest rate, margin added                               4.50% 3.50%
Commitment fees on unused portion of facility                               0.50%  
Outstanding balance on the revolving credit facility                           0      
Leverage ratio         2.75 1.00                      
Default in payment of principal           10,000                      
Debt (Additional Textual) [Abstract]                                  
Unamortized discount on term loan 452     1,306                          
Aggregate Principal Amount of Outstanding Term Loan     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%