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Recent Accounting Pronouncements (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Accounts receivable $ 23,308 $ 22,778
Accrued liabilities $ 12,776 11,149
Adjustment | ASU 2014-09    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Accounts receivable   169
Accrued liabilities   $ 169