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Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2012
Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]
 
 
2012
 
2011
 
2010
Balance, beginning of period
 
$
7,700

 
$
6,580

 
$
5,795

Provision for losses
 
4,860

 
4,156

 
3,063

Write-offs
 
(5,573
)
 
(3,036
)
 
(2,278
)
Balance, end of period
 
$
6,987

 
$
7,700

 
$
6,580