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Accounting Standards and Significant Accounting Policies - Account Receivable (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2018
USD ($)
Allowance for Doubtful Accounts Receivable [Roll Forward]  
Balance, beginning of period December 31, 2017 $ 5,427
Provisions for losses - accounts receivable 1,147
Collection of accounts previously written off (212)
Deductions for accounts charged off or credits issued (1,257)
Balance, end of period $ 5,105