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Accounts Receivable, Net
 12 Months Ended
Dec. 31, 2011
Accounts Receivable, Net [Abstract]  
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]
Accounts Receivable, Net
At December 31, 2011 and 2010 accounts receivable consist of the following:
 
 
2011
 
2010
Trade receivables
 
$
120,349

 
$
115,282

Less: allowance for doubtful accounts
 
(5,571
)
 
(4,240
)
Total
 
$
114,778

 
$
111,042


A summary of changes in the allowance for doubtful accounts for the three-year period ended December 31, 2011 is as follows:
 
 
2011
 
2010
 
2009
Balance at beginning of period
 
$
4,240

 
$
6,778

 
$
5,139

Provision for doubtful accounts
 
—

 
1,000

 
1,900

Additions (deductions), net
 
1,331

 
(3,538
)
 
(261
)
Balance at end of period
 
$
5,571

 
$
4,240

 
$
6,778