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New Accounting Pronouncements (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Other operating expenses | $ 76,785 | $ 61,311 | $ 231,122 | $ 209,581
ASU 2018-02 [Member] |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Reclassification adjustment related to cash flow hedges and investment portfolio credit risk |  |  | 3,000 |
ASU 2016-18 [Member] |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Decrease in net cash provided by operating activities |  |  |  | $ 48,100
ASU 2014-09 [Member] |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Cumulative effect on retained earnings |  |  | 3,900 |
Capital raising and advisory fee revenues | $ 25,900 |  | 25,900 |
Other operating expenses |  |  | $ 25,900 |

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