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
Jul. 31, 2015
Apr. 01, 2015
Jun. 30, 2016
Jun. 30, 2015
Mar. 31, 2016
Goodwill [Line Items]          
Amortization of intangible assets     $ 2,816,000 $ 2,896,000  
Goodwill     124,613,000   $ 121,510,000
Intangible Assets, Net (Excluding Goodwill)     $ 96,052,000   103,998,000
Industrial Process Insulators, Inc.          
Goodwill [Line Items]          
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life     7 years 1 month 28 days    
Amortization of intangible assets     $ 330,000    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Held in Escrow     4,005,000    
Business Acquisition, Percentage of Voting Interests Acquired 100.00%        
Goodwill $ 13,422,000   13,422    
Fair value of total consideration transferred $ 21,750,000        
Intangible Assets, Net (Excluding Goodwill)     $ 7,212,000   12,301,000
Sumac Fabrication Company Limited          
Goodwill [Line Items]          
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     $ 1,103,000    
Business Acquisition, Percentage of Voting Interests Acquired   75.00%      
Payments to Acquire Businesses, Gross   $ 10,956,000      
Debt Instrument, face amount   5,905,000      
Goodwill   7,992,000 7,836,000    
Fair value of total consideration transferred   10,956,000      
Intangible Assets, Net (Excluding Goodwill)     1,879,000   $ 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     901,000 $ 1,009,000  
Canada | Sumac Fabrication Company Limited          
Goodwill [Line Items]          
Debt Instrument, face amount     5,905,000    
Canada | CHS Transactions [Member]          
Goodwill [Line Items]          
Goodwill     36,892,000    
Intangible Assets, Net (Excluding Goodwill)     $ 25,371,000