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Contingencies - Additional Information (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Aug. 31, 2017
USD ($)
Sep. 30, 2019
USD ($)
lawsuit
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
lawsuit
insurance_carrier
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
lawsuit
Dec. 31, 2017
USD ($)
lawsuit
Loss Contingencies [Line Items]              
Product liability expense   $ 1,730 $ 14,627 $ 8,155 $ 25,469    
Loss contingency, years of activity       5 years      
Minimum number of insurance carriers | insurance_carrier       20      
Insurance receivables   57,900   $ 57,900   $ 71,700 $ 134,700
Insurance receivables, current   9,900   9,900   14,800  
Insurance receivables, noncurrent   48,000   48,000   56,900  
Notes receivable from insurance companies   55,600   55,600   59,600 $ 76,900
Notes receivable from insurance companies, current   3,646   3,646   3,555  
Amount reported in notes receivable, insurance companies, noncurrent   52,000   52,000   56,000  
Product warranty expense       8,800 7,900    
Single Incident              
Loss Contingencies [Line Items]              
Product liability accrual   $ 3,000   3,000   $ 3,600  
Product liability expense       $ (600) 1,300    
Lawsuit              
Loss Contingencies [Line Items]              
Number of lawsuits | lawsuit   1,591   1,591   1,481 1,420
Damages from Product Defects              
Loss Contingencies [Line Items]              
Number of lawsuits | lawsuit   2,493   2,493   2,355 2,242
Cumulative Trauma              
Loss Contingencies [Line Items]              
Product liability accrual   $ 151,600   $ 151,600   $ 187,300  
Product liability expense       9,600      
Claims Settled, But Not Yet Paid              
Loss Contingencies [Line Items]              
Product liability accrual   9,500   9,500   24,500  
Uninsured Cumulative Trauma              
Loss Contingencies [Line Items]              
Product liability expense       8,600 $ 25,500    
Other Current Liabilities | Cumulative Trauma              
Loss Contingencies [Line Items]              
Product liability accrual   10,400   10,400   38,800  
Other Noncurrent Liabilities | Cumulative Trauma              
Loss Contingencies [Line Items]              
Product liability accrual           148,500  
Other Noncurrent Liabilities | Cumulative Trauma, Reported Claims              
Loss Contingencies [Line Items]              
Product liability, gross   $ 141,200   141,200      
Settled Litigation              
Loss Contingencies [Line Items]              
Damages awarded $ 75,200            
Payments to resolve cumulative trauma claims       $ 21,400   $ 28,600