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New Accounting Principles and Recent Accounting Pronouncements Narrative (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jan. 01, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018 | [1]
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Operating lease assets | $ 618,100 | $ 565,987 |  | $ 565,987 |  | $ 0
Current operating lease liabilities | 155,500 | 117,071 |  | 117,071 |  | $ 0
Non-current lease liabilities | 468,400 |  |  |  |  |
Retained Earnings |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Cumulative-effect adjustment to retained earnings | $ 116,800 | $ 0 | $ 0 | $ 116,768 | $ 0 |
[1] | Reclassified to conform to current presentation (see Note A).

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