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Deferred Service Contract Revenue (Details) (Service Contract [Member], USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Service Contract [Member]
   
Changes in deferred service contract revenue [Roll forward]    
Beginning Balance $ 8,539,000 $ 5,838,000
Add: Payments received 3,602,000 2,495,000
Add: Contract revenue assumed with business acquisition 0 780,000
Less: Revenue recognized (2,990,000) (2,571,000)
Ending Balance (9,151,000) 6,542,000
Costs incurred under service contracts $ 1,700,000 $ 1,700,000