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Schedule of Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2011
Valuation and Qualifying Accounts [Abstract]  
Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]
Description
Balance at Beginning of Year
Charged (Credited) to Expenses or Other Accounts, Net
Deductions and Adjustments1
Balance at End of Year
YEAR ENDED DECEMBER 31, 2011
 
 
 
 
Allowance for doubtful accounts
3,297

—

(417
)
2,880

YEAR ENDED DECEMBER 31, 2010
 
 
 
 
Allowance for doubtful accounts
3,917

368

(988
)
3,297

YEAR ENDED DECEMBER 31, 2009
 
 
 
 
Allowance for doubtful accounts
10,805

(4,404
)
(2,484
)
3,917

1 Deductions and adjustments for the allowances primarily relate to accounts written off.