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v3.3.1.900

Employee Benefits Plans (Details Textual) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) Age | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension benefits |  | $ 488,682 | $ 448,396 |
Payments for postemployment benefits |  |  | 224,000 |
Pension settlement (benefit) charges |  | (509) | $ 12,564 | $ 2,820
Settlement percentage of pension obligation |  |  | 12.00% |
Pension lump sum settlement expense |  | $ 0 | $ 97,231 | 0
U.S. pension plan assets percentage of total pension plan assets |  | 72.00% |  |
Required pension contributions to our pension plans |  | $ 80,000 |  |
Deferred compensation |  | 43,943 | 40,302 |
Non-qualified supplemental pension plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension benefits |  | 51,000 | 51,000 |
Pension Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension settlement (benefit) charges |  | 0 | 259,319 |
Deferred compensation |  | $ 44,000 | 40,000 |
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 |  |
Assumed change in healthcare cost trend rates in each year |  | 1.00% |  |
Defined Contribution Savings Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Expense related to defined contribution savings plans |  | $ 38,000 | 35,000 | $ 35,000
Rabbi Trusts |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Assets held in trust |  | 43,000 | 41,000 |
Value of common stock issued in trust |  | $ 1,000 | $ 2,000 |
Scenario, Forecast |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension and Other Postretirement Benefit Expense | $ 2,000 |  |  |
Scenario, Forecast | Pension Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Net actuarial loss to be recognized | $ 32,000 |  |  |

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