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Contingencies - Additional Information (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Aug. 31, 2017
USD ($)
Sep. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
LegalMatter
Vendor
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
LegalMatter
Dec. 31, 2017
USD ($)
LegalMatter
Loss Contingencies [Line Items]            
Product liability expense     $ 2,896 $ 2,824    
Loss contingency, years of activity     5 years      
Minimum number of insurance carriers | Vendor     20      
Insurance receivables     $ 64,100   $ 71,700 $ 134,700
Insurance receivables, current     11,500   14,800  
Insurance receivables, noncurrent     52,600   56,900  
Notes receivable from insurance companies     60,000   59,600 $ 76,900
Notes receivable from insurance companies, current     3,586   3,555  
Amount reported in notes receivable, insurance companies, noncurrent     56,400   56,000  
Product warranty expense     2,700 2,600    
Single Incident            
Loss Contingencies [Line Items]            
Product liability accrual     3,500   $ 3,600  
Product liability expense     $ 200 300    
Lawsuit            
Loss Contingencies [Line Items]            
Number of lawsuits | LegalMatter     1,481   1,481 1,420
Damages from Product Defects            
Loss Contingencies [Line Items]            
Number of lawsuits | LegalMatter     2,371   2,355 2,242
Cumulative Trauma            
Loss Contingencies [Line Items]            
Product liability accrual     $ 170,700   $ 187,300  
Product liability expense     3,300 3,200    
Claims Settled, But Not Yet Paid            
Loss Contingencies [Line Items]            
Product liability accrual     16,700   24,500  
Uninsured Cumulative Trauma            
Loss Contingencies [Line Items]            
Product liability expense     2,800 $ 2,800    
Other Current Liabilities | Cumulative Trauma            
Loss Contingencies [Line Items]            
Product liability accrual     22,400   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     148,300      
Settled Litigation            
Loss Contingencies [Line Items]            
Damages awarded $ 75,200          
Payments to resolve cumulative trauma claims     $ 14,300   $ 28,600  
Subsequent Event | Settled Litigation | Scenario, Forecast            
Loss Contingencies [Line Items]            
Accrual payments   $ 7,100