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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment Useful Life      
StandardWarrantyPeriod 1 year    
Incremental Common Shares Attributable to Share-based Payment Arrangements 680,208 506,137 588,697
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 9,824 102,017 112,562
Impact of ASU 2016-09 2.00%    
Cumulative Effect of New Accounting Principle in Period of Adoption $ 1,539    
Excess Tax Benefit from Share-based Compensation, Operating Activities   $ 17,700 $ 12,900
Impact of Adopting ASU 2017-7 ASC 715 Compensation-Retirement Benefits $ 4,100 $ 9,800  
Capitalized Software Costs [Member]      
Property, Plant and Equipment Useful Life      
Property, Plant and Equipment, Useful Life 10 years    
Minimum [Member] | Building and Building Improvements      
Property, Plant and Equipment Useful Life      
Property, Plant and Equipment, Useful Life 15 years    
Minimum [Member] | Machinery and Equipment      
Property, Plant and Equipment Useful Life      
Property, Plant and Equipment, Useful Life 3 years    
Minimum [Member] | Software      
Property, Plant and Equipment Useful Life      
Property, Plant and Equipment, Useful Life 3 years    
Maximum [Member] | Building and Building Improvements      
Property, Plant and Equipment Useful Life      
Property, Plant and Equipment, Useful Life 50 years    
Maximum [Member] | Machinery and Equipment      
Property, Plant and Equipment Useful Life      
Property, Plant and Equipment, Useful Life 12 years    
Maximum [Member] | Software      
Property, Plant and Equipment Useful Life      
Property, Plant and Equipment, Useful Life 10 years    
Retained Earnings [Member]      
Property, Plant and Equipment Useful Life      
Cumulative Effect of New Accounting Principle in Period of Adoption $ 1,539