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New Accounting Principles and Recent Accounting Pronouncements (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Mar. 31, 2018 | Jun. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Reclassification of certain tax effects from accumulated other comprehensive loss to retained earnings |  | $ (30,237)
Accounting Standards Update 2018-02 [Member] | Retirement and Postretirement Benefit Plan Adjustments [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Reclassification of certain tax effects from accumulated other comprehensive loss to retained earnings | $ 28,400 |
Accounting Standards Update 2018-02 [Member] | Deferred Loss On Interest Rate Derivative Hedges [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Reclassification of certain tax effects from accumulated other comprehensive loss to retained earnings |  | $ 1,800

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