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Guarantees (Details) - USD ($)
Sep. 30, 2017
Dec. 31, 2016
Guarantees [Abstract]    
Deferred revenue included in other current and non-current liabilities $ 29,300,000 $ 30,400,000
Amount of residual value guarantees and buyback commitments given by the company $ 28,400,000 $ 32,800,000