Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Other Intangible Assets -Narrative (Details)

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Goodwill and Other Intangible Assets -Narrative (Details) - USD ($)
 3 Months Ended 9 Months Ended
Apr. 01, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Mar. 31, 2016
Jul. 31, 2015
Goodwill [Line Items]              
Goodwill   $ 121,766,000   $ 121,766,000   $ 121,510,000  
Amortization of intangible assets   2,963,000 $ 3,354,000 8,804,000 $ 9,538,000    
Intangible Assets, Net (Excluding Goodwill)   88,661,000   88,661,000   103,998,000  
Industrial Process Insulators, Inc.              
Goodwill [Line Items]              
Business Acquisition, Percentage of Voting Interests Acquired             100.00%
Total consideration             $ 21,750,000
Goodwill   13,249,000   $ 13,249,000     $ 13,249,000
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life       7 years 1 month 28 days      
Amortization of intangible assets       $ 299,000      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Held in Escrow   4,006,000   4,006,000      
Intangible Assets, Net (Excluding Goodwill)   6,830,000   $ 6,830,000   12,301,000  
Sumac Fabrication Company Limited              
Goodwill [Line Items]              
Business Acquisition, Percentage of Voting Interests Acquired 75.00%            
Total consideration $ 10,956,000            
Goodwill 7,992,000            
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life       3 years 7 months 6 days      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Held in Escrow   531,000   $ 531,000      
Payments to Acquire Businesses, Gross 10,956,000            
Debt Instrument, face amount 5,905,000            
Intangible Assets, Net (Excluding Goodwill)   1,445,000   1,445,000   $ 2,056,000  
Minimum | Canadian Dollar | Sumac Fabrication Company Limited              
Goodwill [Line Items]              
Debt Instrument, Maturity Payment Amount 0            
Maximum | Canadian Dollar | Sumac Fabrication Company Limited              
Goodwill [Line Items]              
Debt Instrument, Maturity Payment Amount $ 7,500,000            
Canada              
Goodwill [Line Items]              
Amortization of intangible assets   870,000 $ 867,000 2,661,000 $ 2,872,000    
Canada | Sumac Fabrication Company Limited              
Goodwill [Line Items]              
Debt Instrument, face amount   5,905,000   5,905,000      
Canada | CHS Transactions              
Goodwill [Line Items]              
Goodwill   43,030,000   43,030,000      
Intangible Assets, Net (Excluding Goodwill)   $ 24,485,000   $ 24,485,000