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Supplemental Cash Flow Information
3 Months Ended
Mar. 31, 2013
Supplemental Cash Flow Elements [Abstract]  
Supplemental Cash Flow Information
Supplemental Cash Flow Information
Supplemental cash flow information is as follows (in thousands):
 
Three months ended March 31,
 
2013
 
2012
Supplemental non-cash investing and financing activities:
 
 
 
Equipment acquired through capital leases
$
480

 
$
671

Exercise of stock options by common stock surrender
2,357

 

Supplemental cash payment information:
 
 
 
Interest paid
$
381

 
$
2,621

Income taxes paid
3,537

 
4,224