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New Accounting Pronouncements (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Other operating expenses | $ 81,885 | $ 85,257 | $ 154,337 | $ 148,270
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 |  |  | 73,100 |
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 | 16,200 |  | $ 16,200 |
Other operating expenses | $ 16,200 |  |  |

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