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Commitments and Contingencies (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) property | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) property | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Other Commitments [Line Items] |  |  |  |  |
Number of Leased Properties Owned by Related Parties | property | 2 |  | 2 |  |
Costs and Expenses, Related Party | $ 320 | $ 320 | $ 950 | $ 950 |
Operating Leases, Future Minimum Payments Due | 27,600 |  | 27,600 |  |
Self Insurance Reserve | 2,250 |  | 2,250 |  | $ 2,080
Estimated Insurance Recoveries | 14,890 |  | 14,890 |  | 12,702
Letters of Credit Outstanding, Amount | 4,390 |  | 4,390 |  | $ 4,410
Deferred Compensation Liability, Noncurrent | $ 6,480 |  | $ 6,480 |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -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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