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New Accounting Principles and Recent Accounting Pronouncements - Narrative (Details) - USD ($) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Jan. 01, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Operating lease assets |  | $ 598,293 | $ 0 | [1] |  | $ 618,100
Operating lease liabilities |  | 92,286 | 0 | [1] |  | 155,500
Operating And Finance Lease Liabilities, Noncurrent |  |  |  |  |  | $ 468,400
Reclassification of certain tax effects from accumulated other comprehensive loss |  | 0 | (30,237) |  | $ 0 |
Accumulated Defined Benefit Plans Adjustment Attributable to Parent | 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 | 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 |  |  |  |  |
Retained Earnings |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Sale and leaseback gain recognized upon adoption of ASC 842, net of tax impact |  | 114,712 | 0 |  |  |
Reclassification of certain tax effects from accumulated other comprehensive loss |  | $ 0 | $ 30,237 |  | $ 0 |
Retained Earnings | Accounting Standards Update 2016-02 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Cumulative effect of change on equity or net assets | $ 160,000 |  |  |  |  |
[1] | Reclassified to conform with current presentation (see Note E)

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