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Employee Benefits Plans (Details Textual) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) Age | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2013 Age | Dec. 31, 2018 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Accrued pension liability | $ 416,280,000 | $ 455,736,000 |  |  |
One-time Non-cash Charge | 8,000,000 |  |  |  |
Pension plans, accumulated other comprehensive income (loss) | 13,000,000 |  |  |  |
Pension annuity settlement | (5,454,000) | (7,650,000) | $ 509,000 |  |
Expense related to defined contribution savings plans | 39,000,000 | 38,000,000 | $ 38 |  |
Deferred compensation | 62,680,000 | 49,533,000 |  |  |
Non-qualified supplemental pension plan |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Accrued pension liability | 55,000,000 | 53,000,000 |  |  |
Pension Plans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Payment for settlement | 71,299,000 | 0 |  |  |
Pension annuity settlement | (66,423,000) | 0 |  |  |
Required pension contributions to our pension plans | $ 34,000,000 |  |  |  |
Other Postretirement Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Maximum age limit of qualified retirees for health care benefits | Age | 65 |  |  |  |
Modified age limit of qualified retirees for health care benefits | Age |  |  |  | 52 |
Modified years of service required for qualified retirees for health care benefits |  |  |  | 12 years |
United States |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
U.S. pension plan assets percentage of total pension plan assets | 72.00% |  |  |  |
Scenario, Forecast | Pension Plans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Net actuarial loss to be recognized |  |  |  |  | $ (29,000,000)
Scenario, Forecast | Other Postretirement Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Net actuarial loss to be recognized |  |  |  |  | $ 1,000,000
Rabbi Trusts [Member] | Deferred Compensation Arrangement with Individual, by Type of Compensation, Pension and Other Postretirement Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Assets held in trust | $ 63,000,000 | 50,000,000 |  |  |
Value of common stock issued in trust | $ 2,000,000 | $ 2,000,000 |  |  |

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- Definition Defined Benefit Plans, One-Time Non-Cash Charge + References No definition available. + Details
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- Definition Multiemployer Plans, One Time Charge For Pension Settlement, Pre-Tax, Expense (Benefit) + References No definition available. + Details
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- Definition The total amount of cash and securities held by third party trustees pursuant to terms of debt instruments or other agreements as of the date of each statement of financial position presented, which can be used by the trustee only to pay the noncurrent portion of specified obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(b)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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