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Basis Of Presentation (Details) - USD ($) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2019 | Dec. 31, 2017
Basis Of Presentation [Abstract] |  |  |  |
Days after publication in the Federal Reserve | 30 days |  |  |
U.S. tax rate | 21.00% | 35.00% |  |
Reclass due to early adoption of Accounting Standards Update 2018-02 |  |  |  | $ 1,250,000
Cumulative change due to ASU |  |  | $ 0 | $ 1,201,000
Operating lease right of use assets | $ 66,430,000 |  | $ 69,869,000 |
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] |  |  | us-gaap:OtherAssets |
Operating lease liabilities | $ 73,529,000 |  | $ 77,270,000 |
Operating Lease, Liability, Statement of Financial Position [Extensible List] |  |  | us-gaap:OtherLiabilities |

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- Definition Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption. + References No definition available. + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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