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Revenue Recognition Movement in Standard Product Warranty Accrual (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Product Warranty Liability [Line Items]    
Contract with Customer, Right to Recover Product $ 56,000 $ 56,000
Contract with Customer, Refund Liability 105,000 105,000
Revenue, Variable Consideration Reserve 66,000 103,000
Deferred Service-Type Warranty Revenue 25,511 $ 24,006
Deferred Revenue, Additions 10,875  
Deferred Revenue, Revenue Recognized $ (9,370)  
Minimum    
Product Warranty Liability [Line Items]    
Standard Product Warranty Period 6 months  
Maximum    
Product Warranty Liability [Line Items]    
Standard Product Warranty Period 36 months