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Deferred Service Contract Revenue (Tables)
 3 Months Ended
Mar. 31, 2014
Deferred Service Contract Revenue [Abstract]  
Changes in deferred service contract revenue
The following table provides changes in the deferred service contract revenue balance for the three-month periods ended March 31, 2014 and 2013 (in thousands):

 
 
March 31,
 
 
 
2014
  
2013
 
Beginning Balance
 
$
11,637
  
$
8,539
 
Add: Payments received
  
3,711
   
3,602
 
Less: Revenue recognized
  
(3,056
)
  
(2,990
)
Ending Balance
 
$
12,292
  
$
9,151