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, 2015
Jul. 31, 2015
Apr. 01, 2015
Mar. 31, 2015
Mar. 02, 2015
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]          
Goodwill $ 120,460     $ 105,232  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]          
Non-controlling interests $ 4,006     $ 0  
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   13,784      
Goodwill   10,204      
Total assets   30,034      
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   4,962      
Total liabilities   8,284      
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     123    
Property, plant and equipment     1,316    
Identifiable intangible assets     2,645    
Goodwill     9,255    
Total assets     16,331    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]          
Current liabilities     1,025    
Noncurrent deferred tax liability     714    
Total liabilities     1,739    
Non-controlling interests     3,636    
Total consideration     $ 10,956    
Unitemp          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]          
Accounts receivable         $ 1,346
Inventories         655
Other current assets         21
Property, plant and equipment         77
Identifiable intangible assets         1,294
Goodwill         1,630
Total assets         5,023
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]          
Current liabilities         415
Noncurrent deferred tax liability         718
Total liabilities         1,133
Total consideration         $ 3,890