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Long Term Debt (Details Textual) (USD $)
 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2011
Working Capital Revolver Loan due 2012 [Member]
Jun. 30, 2007
5.5% Convertible Senior Subordinated Notes due 2012 [Member]
Person
Dec. 31, 2007
5.5% Convertible Senior Subordinated Notes due 2012 [Member]
Dec. 31, 2011
Secured Term Loan due 2012 [Member]
Dec. 31, 2011
Other long-term debt [Member]
Dec. 31, 2010
Other long-term debt [Member]
Long-Term Debt (Textual) [Abstract]              
Weighted average interest rate of other debt 4.10%         6.71%  
Maximum amount of revolving credit facility   $ 50,000,000          
Description of Interest rate of Revolving Credit Facility   Interest at a base rate (generally equivalent to the prime rate) plus .50% or LIBOR plus 1.75%          
Secured term loan interest Rate Basis         Three month Libor plus 300 basis points adjusted quarterly    
Debt instrument, maturity date   Apr. 13, 2012          
Line of credit facility, interest rate   3.75%          
Maximum amount of letter of credit   8,500,000          
Remaining borrowing capacity of revolving credit facility   48,600,000          
Fees Expressed as percentage for unused letters of credit   1.00%          
Fees Expressed as percentage for unused revolving credit facility   0.375%          
Carrying value of the pledged assets   258,000,000     72,000,000    
Working capital revolver loan requirements   EBITDA requirement of greater than $25 million; a minimum fixed charge coverage ratio of not less than 1.10 to 1; and a maximum senior leverage coverage ratio of not greater than 4.50 to 1          
Number of Qualified institutional buyers     22        
Aggregate principal amount of debentures sold     60,000,000        
Debt instrument, interest rate   1.75% 5.50% 5.50% 5.15%   6.00%
Original principal amount of secured term loan         50,000,000    
Modified principal amount of secured loan         60,000,000    
Amended additional principal amount of secured loan         15000000    
Amended principal amount of secured loan         75,000,000    
Maturity date of original secured term loan         November 2, 2012    
Maturity date of amended secured term loan         March 29, 2016    
Periodic principal payment of secured loan         900,000    
Interest and final balloon payment of secured loan         56,300,000    
Borrowing interest rate basis spread   0.50%     3.00%    
Period for LIBOR         3 months    
Carrying value of restricted net assets         97,000,000    
Secured term loan agreement requirements         Borrowers are also subject to a minimum fixed charge coverage ratio of not less than 1.10 to 1 and a maximum leverage ratio of not greater than 4.50 to 1    
Initial percentage of principal amount as prepayment premium         0.025    
Reduced prepayment premium percentage         0.010    
Period of time before prepayment premium is reduced         24 months    
Capital lease obligation           $ 749,000 $ 1,211,000
End date of initial prepayment premium period         3/29/2012