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Summary of Significant Accounting Policies - New Accounting Pronouncements (Details) - USD ($) $ in Thousands | Jan. 01, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Adjustments to equity |  | $ 3,104,950 | $ 3,199,405
Comprehensive Income | Subsequent Event | ASU 2016-01 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Adjustments to equity | $ (86,572) |  |
Retained Earnings | Subsequent Event | ASU 2016-01 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Adjustments to equity | $ 86,572 |  |

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