Quarterly report pursuant to Section 13 or 15(d)

Revenue - Impact on Financial Statements(Details)

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Revenue - Impact on Financial Statements(Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Jan. 01, 2018
Dec. 31, 2017
Income Statement        
Revenues $ 179,059 $ 152,396    
Sales 179,059 152,396    
Cost of Products Sold 141,927 114,079    
Provision for Income Taxes 632 3,904    
Net Income 3,294 11,587    
Balance Sheet        
Accounts Receivable, Net of Allowance for Doubtful Accounts 157,650   $ 136,638 $ 132,633
Inventories 159,961   142,239 150,196
Accrued Expenses and Other Current Liabilities 36,510     38,749
Customer Advance Payments and Deferred Revenue 22,164   11,431 19,607
Other Liabilities 33,376     34,060
Other Shareholders’ Equity 352,007     342,982
Calculated under Revenue Guidance in Effect before Topic 606        
Income Statement        
Cost of Products Sold 140,580      
Provision for Income Taxes 339      
Net Income 2,315      
Balance Sheet        
Accounts Receivable, Net of Allowance for Doubtful Accounts 151,791     132,633
Inventories 169,327     150,196
Accrued Expenses and Other Current Liabilities 35,871      
Customer Advance Payments and Deferred Revenue 31,168     $ 19,607
Other Liabilities 32,765      
Other Shareholders’ Equity 347,760      
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606        
Income Statement        
Cost of Products Sold 1,347      
Provision for Income Taxes 293      
Net Income 979      
Balance Sheet        
Accounts Receivable, Net of Allowance for Doubtful Accounts 5,859   4,005  
Inventories (9,366)   (7,957)  
Accrued Expenses and Other Current Liabilities 639      
Customer Advance Payments and Deferred Revenue (9,004)   $ (8,176)  
Other Liabilities 611      
Other Shareholders’ Equity 4,247      
Aerospace        
Income Statement        
Revenues 164,600 136,827    
Sales 164,600      
Aerospace | Calculated under Revenue Guidance in Effect before Topic 606        
Income Statement        
Revenues 163,942      
Aerospace | Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606        
Income Statement        
Revenues 658      
Test Systems        
Income Statement        
Revenues 14,459 $ 15,569    
Sales 14,459      
Test Systems | Calculated under Revenue Guidance in Effect before Topic 606        
Income Statement        
Revenues 12,498      
Test Systems | Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606        
Income Statement        
Revenues $ 1,961