Quarterly report pursuant to Section 13 or 15(d)

Revenue - Allowance for Doubtful Accounts (Details)

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Revenue - Allowance for Doubtful Accounts (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Allowance for Doubtful Accounts Receivable [Roll Forward]    
Beginning balance $ 8,680 $ 10,091
(Recovery) additions charged to statements of operations (802) 2,372
Less: Bad debt write offs (3,723) 1,858
Ending balance $ 4,155 $ 14,321