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Notes Receivable (Tables)
 12 Months Ended
Dec. 31, 2012
Receivables [Abstract]  
Schedule of Notes Receivable
At December 31, notes receivable consisted of the following (in thousands):

 
December 31,
 
2012
 
2011
Independent contractor notes receivable
$
12,468

 
$
9,304

Other notes receivable
6,907

 
7,629

 
19,375

 
16,933

Less current portion
5,514

 
4,900

Notes receivable – non-current
$
13,861

 
$
12,033