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Supplemental Cash Flow Information
6 Months Ended
Jun. 30, 2012
Supplemental Cash Flow Information [Abstract]  
Supplemental Cash Flow Information
Supplemental Cash Flow Information
 
Six Months Ended June 30,
 
2012
 
2011
Supplemental disclosure of cash flow information:
 
 
 
Interest paid
$
234,862

 
$
201,541

Income taxes paid
2,556

 
3,543

Supplemental disclosure of non-cash financing activities:
 
 
 
Assets acquired through capital leases and installment sales
11,837

 
13,025

Conversion of redeemable convertible preferred stock (note 7)
305,180