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New accounting standards New accounting standards (Details) - USD ($) $ in Thousands | Jan. 01, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Accounting Standards Update 2016-02 | Lease Assets |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | $ 2,783,784 |  |
Accounting Standards Update 2016-02 | Lease Liabilities |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | 3,001,354 |  |
Cash Flow Impact | Accounting Standards Update 2016-02 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | $ 0 |  |
Retained earnings |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cumulative effect of change in accounting principle |  | $ 39,876 | $ 8,368

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