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Long-term Debt (Details Textual) (USD $)
 6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Revolving loan [Member]
    
Long term debt (Textual) [Abstract]    
Date of maturity Mar. 19, 2014  
Amount outstanding under senior credit facility   $ 9,000,000
Term loan [Member]
    
Long term debt (Textual) [Abstract]    
Date of maturity Dec. 31, 2014  
Amount outstanding under senior credit facility 460,600,000 463,000,000
Senior credit facility [Member]
    
Long term debt (Textual) [Abstract]    
Secured Debt 460,557,000 471,968,000
Interest rate on the balance outstanding under the senior credit facility 3.70% 3.80%
Deferred loan cost balance, net of accumulated amortization 3,300,000 4,000,000
10 1/2% senior secured second lien notes at liquidation value [Member]
    
Long term debt (Textual) [Abstract]    
Senior Subordinated Notes Maturity Date Jun. 29, 2015  
Secured Debt 365,000,000 365,000,000
Interest rate on note 10.50% 10.50%
Yield on note 11.00% 11.00%
Deferred loan cost balance, net of accumulated amortization $ 5,300,000 $ 6,100,000