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Commitments and Contingencies (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Dec. 31, 2015
Loss Contingencies [Line Items]                
Letters of credit outstanding $ 244,700   $ 244,700     $ 219,100    
Surety bonds outstanding 1,200,000   $ 1,200,000     1,100,000    
Litigation Settlement, Expense   $ 15,000   $ 15,000        
Maximum product warranty in years     10 years          
Self-insurance liabilities $ 824,625 $ 931,950 $ 824,625 $ 931,950 $ 814,756 831,058 $ 936,711 $ 924,563
Incurred but not reported percentage of liability reserves 69.00%   69.00%          
Write-off of insurance receivables 5326   20326          
litigation of recorded insurance receivable     $ 77,500          
Other Assets                
Loss Contingencies [Line Items]                
Recorded insurance receivables $ 261,100   $ 261,100     $ 307,300