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Commitments and Contingencies (Narrative) (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) claim | Sep. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2016 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Letters of credit outstanding |  | $ 219,600 |  |  | $ 235,500 |  |
Surety bonds outstanding |  | $ 1,200,000 |  |  | 1,200,000 |  |
Maximum product warranty in years |  | 10 years |  |  |  |  |
Number of individual claims managed | claim |  | 1,000 |  |  |  |  |
Self-insurance liabilities | $ 824,625 | $ 726,497 | $ 824,625 | $ 725,482 | $ 758,812 | $ 814,756 | $ 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 | $ 5,300 |  | $ 20,300 |  |  |  |
Litigation of recorded insurance receivable |  | 21,500 |  |  |  |  |
Other Assets |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Recorded insurance receivables |  | $ 151,200 |  |  | $ 213,400 |  |

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