Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Other Intangible Assets - Acquisition Consideration (Details)

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Goodwill and Other Intangible Assets - Acquisition Consideration (Details) - USD ($)
3 Months Ended
Jul. 31, 2015
Apr. 01, 2015
Jun. 30, 2016
Mar. 31, 2016
Business Acquisition [Line Items]        
Goodwill     $ 124,613,000 $ 121,510,000
Industrial Process Insulators, Inc.        
Business Acquisition [Line Items]        
Business Acquisition, Percentage of Voting Interests Acquired 100.00%      
Goodwill $ 13,422,000   $ 13,422  
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life     7 years 1 month 28 days  
Consideration to or on behalf of sellers at close 21,750,000      
Fair value of total consideration transferred $ 21,750,000      
Sumac Fabrication Company Limited        
Business Acquisition [Line Items]        
Business Acquisition, Percentage of Voting Interests Acquired   75.00%    
Goodwill   $ 7,992,000 $ 7,836,000  
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life     3 years 7 months 6 days  
Consideration to or on behalf of sellers at close   10,956,000    
Fair value of total consideration transferred   $ 10,956,000