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Financing Receivables - Schedule of Financing Receivables (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Receivables [Abstract]        
Financing receivables $ 38,156 $ 22,977    
Allowance for doubtful accounts (7,779) (8,411) $ (7,904) $ (9,175)
Financing receivables, net of allowances $ 30,377 $ 14,566