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Trade Accounts Payable and Accrued Expenses
 12 Months Ended
Dec. 31, 2012
Trade Accounts Payable and Accrued Expenses [Abstract]  
Trade Accounts Payable and Accrued Expenses
6. Trade Accounts Payable and Accrued Expenses

 

Trade accounts payable and accrued expenses consist of the following:

 

December 31,   2012     2011  
             
Trade accounts payable   $ 13,387     $ 12,263  
Accrued expenses     25,113       16,329  
    $ 38,500     $ 28,592