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New Accounting Pronouncements - Additional Information (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Jan. 01, 2019 | Jan. 01, 2018
--- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Operating lease assets | $ 308,166 |  |
Lease Liabilities | $ 317,642 |  |
Impact of new accounting pronouncements |  | $ (6,771) | $ 1,721
Accounting Standards Update 2016-02 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Operating lease assets |  | 336,083 |
Lease Liabilities |  | 344,362 |
Reduction to deferred tax liabilities |  | 1,508 |
Retained Earnings |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Impact of new accounting pronouncements |  | (6,771) | $ 1,897
Retained Earnings | Accounting Standards Update 2016-02 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Impact of new accounting pronouncements |  | $ (6,771) |

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