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Deferred Service Contract Revenue (Details) (USD $)
9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Changes in deferred service contract revenue [Roll forward]    
Beginning Balance $ 8,539,000 $ 5,838,000
Add: Payments received 10,869,000 9,335,000
Add: Contract revenue assumed with business acquisition 0 780,000
Less: Revenue recognized (8,937,000) (8,359,000)
Ending Balance 10,471,000 7,594,000
Service Contract [Member]
   
Changes in deferred service contract revenue [Roll forward]    
Costs incurred under service contracts $ 5,200,000 $ 5,400,000