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Commitments and Contingencies (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Loss Contingencies [Line Items]              
Letters of credit outstanding   $ 214,600     $ 235,500    
Surety bonds outstanding   $ 1,200,000     1,200,000    
Maximum product warranty in years   10 years          
Self-insurance liabilities $ 814,756 $ 725,482 $ 814,756 $ 771,104 $ 758,812 $ 835,326 $ 831,058
Incurred but not reported percentage of liability reserves   62.00%     65.00%    
Adjustment to self insurance reserves   $ 37,900 $ 19,800        
Write-off of insurance receivables $ 15,000            
Litigation of recorded insurance receivable   22,300          
Other Assets              
Loss Contingencies [Line Items]              
Recorded insurance receivables   $ 155,300     $ 213,400