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Commitments and Contingencies (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Dec. 31, 2014
Loss Contingencies [Line Items]                
Letters of credit outstanding $ 245,700   $ 245,700     $ 191,300    
Surety bonds outstanding 1,100,000   1,100,000     1,000,000    
Litigation settlement expense 15,000 $ 20,000 $ 15,000 $ 20,000        
Maximum product warranty in years     10 years          
Self-insurance liabilities $ 702,547 702,484 $ 702,547 702,484 $ 707,306 $ 692,053 $ 700,133 $ 710,245
Incurred but not reported percentage of liability reserves 64.00%   64.00%     65.00%    
Gain (loss) related to litigation settlement   $ 5,700   $ 32,600        
litigation of recorded insurance receivable     $ 108,100          
Other Assets                
Loss Contingencies [Line Items]                
Recorded insurance receivables $ 136,900   $ 136,900     $ 130,200