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Employee Benefit Plans and Other Postretirement Benefits (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Retirement age threshold |  | 55 years |  |
Postretirement benefits eligibility, years of service requirement |  | 10 years |  |
Period over which asset gain (losses) are amortized |  | 5 years |  |
Company contributions |  | $ 19,000 | $ 18,200 | $ 18,000
Pension and SERPA Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Accumulated benefit obligation |  | 2,100,000 | 1,900,000 |
Projected benefit obligations |  | $ 2,201,021 | $ 1,986,435 | $ 2,009,000
Expected return on plan assets |  | 7.25% | 7.50% | 7.75%
Company contributions |  | $ 25,000 | $ 25,000 |
Pension Plan Assets |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Investment in company common stock - shares |  | 1,273,592 | 1,273,592 |
Investment in company common stock - value |  | $ 64,800 | $ 74,300 |
Company contributions |  | $ 25,000 |  |
Pension Plan Assets | Scenario, Forecast |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Expected return on plan assets | 7.25% |  |  |
Pension Plan Assets | Equity Securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target plan asset allocation |  | 63.00% |  |
Pension Plan Assets | Fixed Income Securities and Cash and Cash Equivalents |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target plan asset allocation |  | 37.00% |  |
Postretirement Health Coverage |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Projected benefit obligations |  | $ 338,488 | $ 346,431 | $ 354,739
Expected return on plan assets |  | 7.25% | 7.50% | 7.70%
Company contributions |  | $ 15,000 | $ 0 |
Postretirement Health Coverage | Scenario, Forecast |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Expected return on plan assets | 7.25% |  |  |
Postretirement Health Coverage | Equity Securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target plan asset allocation |  | 69.00% |  |
Postretirement Health Coverage | Fixed Income Securities and Cash and Cash Equivalents |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target plan asset allocation |  | 31.00% |  |

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- Definition Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs, Amortization Period For Asset Gain (Loss) + References No definition available. + Details
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- Definition Defined Benefit Plan, Retirement Age Threshold + References No definition available. + Details
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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition The amount of employer securities or securities of parties related to the employer that are included in plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (n) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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