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Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Accounts receivable | $ 22,516 | $ 22,778
Accrued liabilities | $ 11,793 | 11,149
Adjustment | ASU 2014-09 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Accounts receivable |  | 169
Accrued liabilities |  | $ 169

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