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Significant Accounting Policies Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2019 | Dec. 31, 2019 | Sep. 30, 2019 | Jan. 01, 2019 | Dec. 31, 2018 | Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Operating Lease, Right-of-Use Asset |  |  | $ 299,500 | $ 170,500 |  |
Operating Lease, Liability |  |  | $ 325,300 | $ 174,400 |  |
Recognition of right of use asset related to the new corporate headquarters facility | $ 121,700 |  |  |  |  |
Recognition of operating lease liability related to the new corporate headquarters facility | $ 121,700 |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  |  |  | $ (14,672) | $ (2,285)
Retained Earnings [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  |  |  | (14,672) | $ (2,285)
Previously reported cumulative effect reduction to retained earnings |  |  |  |  | (12,600) |
Retroactive adjustment to cumulative effect for new accounting principle |  |  |  |  | $ (2,100) |
Two Thousand And Nineteen [Member] | Scenario, Forecast [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Additional premium amortization expense on securities |  | $ 5,200 |  |  |  |

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