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Commitments And Contingencies (Narrative) (Details) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) claim | Dec. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) claim | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |
Operating lease rent expense |  |  | $ 30,800 | $ 33,000 | $ 27,700 |
Letters of credit outstanding, amount | $ 235,500 | $ 219,100 | 235,500 | 219,100 |  |
Surety Bonds Outstanding | $ 1,200,000 | 1,100,000 | $ 1,200,000 | 1,100,000 |  |
Charges related to contractual dispute |  |  |  | 15,000 | 20,000 |
Maximum product warranty in years |  |  | 10 years |  |  |
Loss Contingency, Pending Claims, Number | claim | 1,000 |  | 1,000 |  |  |
Self-insurance liabilities | $ 758,812 | $ 831,058 | $ 758,812 | $ 831,058 | 924,563 | $ 995,692
Incurred but not reported percentage of liability reserves | 65.00% | 70.00% | 65.00% | 70.00% |  |
Adjustment to self insurance reserves | $ 75,300 | $ 55,200 | $ (95,100) | $ (55,200) | (62,200) |
Increase (Decrease) in Self Insurance Reserve |  |  |  |  | $ (29,600) |
Florida [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Product Warranty Expense |  |  | $ 12,400 |  |  |

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