Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Other Intangible Assets - Provisional Estimates and Final Estimates of Fair Value of Assets and Liabilities Assumed (Details)

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Goodwill and Other Intangible Assets - Provisional Estimates and Final Estimates of Fair Value of Assets and Liabilities Assumed (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Mar. 31, 2016
Jul. 31, 2015
Business Acquisition [Line Items]      
Goodwill $ 121,766 $ 121,510  
Industrial Process Insulators, Inc.      
Business Acquisition [Line Items]      
Identifiable intangible assets     $ 9,026
Goodwill 13,249   13,249
Noncurrent deferred tax liability 3,249   3,249
Customer Relationships | Industrial Process Insulators, Inc.      
Business Acquisition [Line Items]      
Identifiable intangible assets $ 5,962    
Previously Reported | Industrial Process Insulators, Inc.      
Business Acquisition [Line Items]      
Goodwill     10,204
Noncurrent deferred tax liability     4,962
Previously Reported | Customer Relationships | Industrial Process Insulators, Inc.      
Business Acquisition [Line Items]      
Identifiable intangible assets     $ 10,720