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Valuation and Qualifying Accounts Valuation and Qualifying Accounts (Tables)
 12 Months Ended
Dec. 31, 2012
Valuation and Qualifying Accounts Disclosure [Line Items]  
valuation and qualifying accounts [Table Text Block]
 
 
 
 
Additions
 
 
 
 
 
 
 
 
Balance at
Beginning of
Period
 
Charged to
Costs and
Expenses
 
Charged to
Other
Accounts
 
Write-offs
 
Other(1)
 
Balance
at End
of Period
Year ended December 31, 2012
 
 
 
 
 
 
 
 
 
 
 
 
Allowance for uncollectible accounts(2)
 
$
14,978

 
$
6,396

 
$
—

 
$
(5,134
)
 
$
306

 
$
16,546

Year ended December 31, 2011
 
 
 
 
 
 
 
 
 
 
 
 
Allowance for uncollectible accounts(2)
 
$
13,801

 
$
6,742

 
$
—

 
$
(6,178
)
 
$
613

 
$
14,978

Year ended December 31, 2010
 
 
 
 
 
 
 
 
 
 
 
 
Allowance for uncollectible accounts(2)
 
$
13,015

 
$
7,366

 
$
—

 
$
(7,237
)
 
$
657

 
$
13,801