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Commitments and Contingencies (Schedule of Changes in Warranty Obligation) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Apr. 01, 2018
Dec. 31, 2018
Jan. 01, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Sales returns $ 42,202   $ 46,318  
Movement in Standard Product Warranty Accrual [Roll Forward]        
Balance as of beginning of the period 14,412 $ 44,068    
Reclassified to sales returns upon adoption of ASC 606 0 (29,147)    
Provision for warranty obligation made during the period 1,281 3,844    
Settlements made during the period (3,162) (3,273)    
Balance at end of period $ 12,531 $ 15,492    
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Sales returns       $ 29,100