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Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Item Effected [Line Items] |  |
Assets | $ 6,051,463 | $ 5,887,284
Liabilities and shareholders' equity | 6,051,463 | $ 5,887,284
Minimum | Accounting Standards Update 2016-02 |  |
Item Effected [Line Items] |  |
Assets | 7,000 |
Liabilities and shareholders' equity | 7,000 |
Maximum | Accounting Standards Update 2016-02 |  |
Item Effected [Line Items] |  |
Assets | 10,000 |
Liabilities and shareholders' equity | 10,000 |
Accounting Standards Update 2018-02 |  |
Item Effected [Line Items] |  |
Reclassification of tax effects related to the Tax Cuts and Jobs Act | $ 720 |

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