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Significant Accounting Policies - Narrative (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Mar. 31, 2019
--- | --- | --- | --- | ---
Retained earnings | $ 2,184,691 |  | $ 2,141,302 | $ 2,031,487
Accounting Standards Update 2016 13 [Member] |  |  |  |
Retained earnings |  | $ (700) |  |

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