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 ($)
$ in Thousands
Dec. 31, 2016
Mar. 31, 2016
Jul. 31, 2015
Apr. 01, 2015
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]        
Goodwill $ 121,766 $ 121,510    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]        
Non-controlling interests 4,525 $ 4,279    
Industrial Process Insulators, Inc.        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]        
Cash     $ 1,526  
Accounts receivable     3,723  
Inventories     474  
Other current assets     204  
Property, plant and equipment     119  
Identifiable intangible assets     9,026  
Goodwill 13,249   13,249  
Total assets     28,321  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]        
Current liabilities     2,203  
Uncertain tax position liability     1,119  
Noncurrent deferred tax liability $ 3,249   3,249  
Total liabilities     6,571  
Total consideration     $ 21,750  
Sumac Fabrication Company Limited        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]        
Accounts receivable       $ 1,693
Inventories       1,299
Other current assets       33
Property, plant and equipment       1,316
Identifiable intangible assets       3,085
Goodwill       7,992
Deferred tax asset       111
Total assets       15,529
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]        
Current liabilities       935
Total liabilities       935
Non-controlling interests       3,638
Total consideration       $ 10,956