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Commitments and Contingencies (Narrative) (Details)
$ in Thousands
 6 Months Ended
Jun. 30, 2016
USD ($)
claim
Jun. 30, 2015
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Loss Contingencies [Line Items]            
Letters of credit outstanding $ 227,200     $ 191,300    
Surety bonds outstanding $ 1,100,000     1,000,000    
Maximum product warranty in years 10 years          
Pending claims | claim 1,000          
Self-insurance liabilities $ 707,306 $ 700,133 $ 692,980 $ 692,053 $ 720,767 $ 710,245
Incurred but not reported percentage of liability reserves 64.00%     65.00%    
litigation of recorded insurance receivable 108100          
Gain (loss) related to litigation settlement   $ 26,900        
Other Assets            
Loss Contingencies [Line Items]            
Recorded insurance receivables $ 136,700     $ 130,200