Discontinued Operations (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Nov. 28, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Total assets (1) $ 1,900,000   $ 1,700,000  
Total liabilities (1) 2,300,000   5,600,000  
Discontinued Operations, Disposed of by Sale        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Loss on sale of business     62,300,000  
Revenues 0 $ 25,400,000    
Cost of goods sold 0 17,100,000    
Gross profit 0 8,300,000    
Research and development expenses 0 2,200,000    
Selling and administrative expenses 0 4,700,000    
Restructuring charges 0 100,000    
Operating expenses 0 7,000,000    
Disposal Group, Including Discontinued Operation, Other Income (200,000)      
Other (income) expense, net   600,000    
Earnings from discontinued operations before taxes (1) 200,000 700,000    
Provision for (benefit from) income taxes 100,000 (1,100,000)    
Earnings from discontinued operations, net of tax 100,000 1,800,000    
Receivables 1,800,000   1,200,000  
Prepaid and other current assets 100,000   500,000  
Total current assets 1,900,000   1,700,000  
Total assets (1) 1,900,000   1,700,000  
Accounts payable 0   100,000  
Other current liabilities 2,300,000   5,500,000  
Total current liabilities 2,300,000   5,600,000  
Total liabilities (1) 2,300,000   5,600,000  
Depreciation 0 600,000    
Amortization of intangible assets 0 300,000    
Capital expenditures 0 900,000    
Precision Devices | Timing Device Business | Discontinued Operations, Disposed of by Sale        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Consideration received for disposal group       $ 130,000,000
Proceeds from the sale of business     133,300,000  
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax     400,000  
Prepaid Expenses and Other Current Assets | Precision Devices | Timing Device Business        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Proceeds from the sale of business     $ 10,000,000.0  
Accounts Payable | Discontinued Operations, Disposed of by Sale        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Capital expenditures $ 0 $ 200,000