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Deferred Service Contract Revenue (Tables)
 9 Months Ended
Sep. 30, 2013
Deferred Service Contract Revenue [Abstract]  
Changes in deferred service contract revenue
The following table provides changes in deferred service contract revenue for the nine-month periods ended September 30, 2013 and 2012 (in thousands):

 
 
September 30,
 
 
 
2013
  
2012
 
Beginning Balance
 
$
8,539
  
$
5,838
 
Add:         Payments received
  
10,869
   
9,335
 
Add:         Contract revenue assumed with business acquisition
  
—
   
780
 
Less:         Revenue recognized
  
(8,937
)
  
(8,359
)
Ending Balance
 
$
10,471
  
$
7,594