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Schedule II - Valuation and Qualifying Accounts (Tables)
 12 Months Ended
Dec. 31, 2011
Valuation and Qualifying Accounts [Abstract]  
Schedule of Valuation and Qualifying Accounts [Table Text Block]
Description
Balance
at
Beginning
of Year
 
Charged
to Cost
and
Expenses
 
Deductions
(1)
 
Balance
at End
of Year
Allowance for doubtful accounts:
 
 
 
 
 
 
 
Year ended December 31, 2011
$
387

 
$
12

 
$
—

 
$
399

Year ended December 31, 2010
$
1,150

 
$
38

 
$
(801
)
 
$
387

Year ended December 31, 2009
$
1,130

 
$
408

 
$
(388
)
 
$
1,150

(1)
Primarily payments and adjustments to required reserves.