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Deferred Service Contract Revenue (Details) (USD $)
6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Changes in deferred service contract revenue [Roll forward]    
Beginning Balance $ 8,539,000 $ 5,838,000
Add: Payments received 7,140,000 6,033,000
Add: Contract revenue assumed with business acquisition 0 780,000
Less: Revenue recognized (5,964,000) 5,645,000
Ending Balance 9,715,000 7,006,000
Service Contract [Member]
   
Changes in deferred service contract revenue [Roll forward]    
Costs incurred under service contracts $ 3,500,000 $ 3,600,000