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New Accounting Principles and Recent Accounting Pronouncements - Narrative (Details) - USD ($) $ in Thousands | Jan. 01, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Operating lease assets |  | $ 927,658 | $ 598,293 | $ 618,100 |  |
Operating lease liabilities |  | 103,758 | 92,286 | 155,500 |  |
Operating and finance lease liabilities, noncurrent |  |  |  | $ 468,400 |  |
Cumulative effect adjustment |  | 4,394,147 | 5,804,611 |  | $ 5,197,642 |
Retained Earnings |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Cumulative effect adjustment |  | 5,369,538 | 6,614,304 |  | 5,513,529 | $ 5,245,242
Retained Earnings | Cumulative Effect, Period Of Adoption, Adjustment |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Cumulative effect adjustment |  |  |  |  | 114,712 |
Retirement and Postretirement Benefit Plan Adjustments |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Cumulative effect adjustment |  | (275,632) | (218,015) |  | (182,036) |
Retirement and Postretirement Benefit Plan Adjustments | Accounting Standards Update 2018-02 |  |  |  |  |  |
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 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Cumulative effect adjustment |  | $ (1,690) | $ (2,894) |  | $ (7,899) |
Deferred Loss on Interest Rate Derivative Hedges | Accounting Standards Update 2018-02 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Reclassification of certain tax effects from accumulated other comprehensive loss | $ 1,800 |  |  |  |  |

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- Definition Present value of lessee's discounted obligation for lease payments from operating lease, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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