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Financing Receivables - Schedule of Financing Receivables (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Receivables [Abstract]        
Financing receivables $ 36,501 $ 29,776    
Allowance for doubtful accounts (8,289) (9,175) $ (9,254) $ (10,576)
Financing receivables, net of allowances $ 28,212 $ 20,601