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New Accounting Standards New Accounting Standards (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2018
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Cumulative effect of accounting changes (Note 2) $ 1,300
Accounting Standards Update 2016-15  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Cumulative effect of accounting changes (Note 2) 9,600
Net Parent Investment in Apergy  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Cumulative effect of accounting changes (Note 2) $ 1,315