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Commitments And Contingencies (Changes in Self-insurance Liability) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract] |  |  |  |  |  |
Write-off of insurance receivables | -9297 | -5326 | -15000 | 29624 |  |
Litigation of Recorded Insurance Receivable |  |  |  | $ 71,600 |  |
Insurance Settlements Receivable | $ 213,407 |  |  | 213,407 | $ 307,344 |
Insurance Related Expenses [Roll Forward] |  |  |  |  |  |
Balance, beginning of period |  |  | $ 831,058 | 831,058 | 924,563 | $ 995,692
Reserves provided |  |  |  | 81,503 | 97,916 | 80,860
Increase (Decrease) in Liability for Claims and Claims Adjustment Expense Reserve |  |  |  | (97,789) | (57,132) | (64,775)
Payments |  |  |  | (55,960) | (134,289) | (87,214)
Balance, end of period | $ 758,812 |  |  | $ 758,812 | $ 831,058 | 924,563
Loss Contingency, Receivable, Period Increase (Decrease) |  |  |  |  |  | $ 32,600

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- Definition Changes in Self-insurance Liability [Roll Forward] + References No definition available. + Details
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- Definition Litigation of Recorded Insurance Receivable + References No definition available. + Details
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- Definition Write-off of insurance receivables + References No definition available. + Details
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- Definition Amount of increase (decrease) in liability to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition Amount of increase (decrease) of receivables pertaining to a loss contingency. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82913245&loc=d3e12053-110248 + Details
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- Definition Amount, after effects of reinsurance, of payments to settle insured claims and pay costs incurred in the claims settlement process. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 + Details
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- Definition Carrying amount (including both current and noncurrent portions) of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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