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Commitments and Contingencies (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Loss Contingencies [Line Items]        
Loss Contingency Accrual $ 34,600   $ 34,600  
Letters of credit outstanding 226,300   235,500  
Surety bonds outstanding $ 1,200,000   1,200,000  
Maximum product warranty in years 10 years      
Self-insurance liabilities $ 771,100 $ 835,326 $ 758,812 $ 831,058
Incurred but not reported percentage of liability reserves 64.00%   65.00%  
Write-off of insurance receivables   15000000    
litigation of recorded insurance receivable $ 70,100      
Other Assets        
Loss Contingencies [Line Items]        
Recorded insurance receivables $ 217,100   $ 213,400