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Deferred Service Contract Revenue (Tables)
 3 Months Ended
Mar. 31, 2013
Deferred Service Contract Revenue [Abstract]  
Changes in deferred service contract revenue
The following table provides changes in deferred service contract revenue for the three-month periods ended March 31, 2013 and 2012 (in thousands):

 
March 31
 
2013
2012
Beginning Balance
$
8,539
$
5,838
Add:         Payments received
3,602
 
2,495
Add:         Contract revenue assumed with business acquisition
—
780
Less:         Revenue recognized
(2,990
)
(2,571
)
Ending Balance
$
(9,151
) 
$
6,542