Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Other Intangible Assets -Acquisition Recognized Identified Assets Acquired and Liabilities (Details)

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Goodwill and Other Intangible Assets -Acquisition Recognized Identified Assets Acquired and Liabilities (Details) - USD ($)
Sep. 30, 2016
Mar. 31, 2016
Jul. 31, 2015
Apr. 01, 2015
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]        
Goodwill $ 123,958,000 $ 121,510,000    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]        
Non-controlling interests 4,566,000 $ 4,279,000    
Industrial Process Insulators, Inc.        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]        
Cash     $ 1,526,000  
Accounts receivable     3,723,000  
Inventories     474,000  
Other current assets     204,000  
Property, plant and equipment     119,000  
Identifiable intangible assets     9,026,000  
Goodwill 13,249,000   13,249,000  
Total assets     28,321,000  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]        
Current liabilities     2,203,000  
Uncertain tax position liability     1,119,000  
Noncurrent deferred tax liability 3,249,000   3,249,000  
Total liabilities     6,571,000  
Total consideration     $ 21,750,000  
Sumac Fabrication Company Limited        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]        
Accounts receivable       $ 1,693,000
Inventories       1,299,000
Other current assets       33,000
Property, plant and equipment       1,316,000
Identifiable intangible assets       3,085,000
Goodwill 7,717,000     7,992,000
Deferred tax asset       111,000
Total assets       15,529,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]        
Current liabilities       935,000
Total liabilities       935,000
Non-controlling interests       3,638,000
Total consideration       $ 10,956,000
Customer Relationships | Industrial Process Insulators, Inc.        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]        
Identifiable intangible assets $ 5,962,000