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New Accounting Principles and Recent Accounting Pronouncements (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Reclassification of certain tax effects from accumulated other comprehensive loss |  | $ (30,237)
Accounting Standards Update 2016-02 [Member] | Liabilities [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
New accounting pronouncement, expected effect |  | (160,000)
Accounting Standards Update 2016-02 [Member] | Assets [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
New accounting pronouncement, expected effect |  | 800,000
Retirement and Postretirement Benefit Plan Adjustments [Member] | Accounting Standards Update 2018-02 [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Reclassification of certain tax effects from accumulated other comprehensive loss | $ 28,400 |
Deferred Loss On Interest Rate Derivative Hedges [Member] | Accounting Standards Update 2018-02 [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Reclassification of certain tax effects from accumulated other comprehensive loss | $ 1,800 |
Retained Earnings [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Reclassification of certain tax effects from accumulated other comprehensive loss |  | 30,237
Retained Earnings [Member] | Accounting Standards Update 2016-02 [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
New accounting pronouncement, expected effect |  | $ 160,000

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- Definition Amount of cumulative effect of the change in accounting principle or new accounting pronouncement on retained earnings or other components of equity or net assets in the statement of financial position as of the beginning of the earliest period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22580-107794 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22583-107794 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22499-107794 + Details
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