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Financing Receivables - Schedule of Financing Receivables (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Receivables [Abstract]        
Financing receivables $ 20,380 $ 26,591    
Allowance for doubtful accounts (6,472) (7,086) $ (8,102) $ (12,541)
Financing receivables, net of allowances $ 13,908 $ 19,505