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Business Changes and Developments - Goodwill Associated with Acquisitions (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Goodwill [Roll Forward] |  |  |
Balance at beginning of period | $ 131,387 | $ 134,231 |
Foreign Currency Translation and Other | 2,292 | (2,844) |
Goodwill, Impairment Loss | (2,921) |  |
Balance at end of period | 130,758 | 131,387 | $ 134,231
Goodwill, Impaired, Accumulated Impairment Loss | 38,528 | 35,607 | 35,607
Goodwill, Gross | 169,286 | 166,994 | 169,838
Investment Banking [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Balance at beginning of period | 120,464 | 123,308 |
Foreign Currency Translation and Other | 2,292 | (2,844) |
Goodwill, Impairment Loss | 0 |  |
Balance at end of period | 122,756 | 120,464 | 123,308
Investment Management [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Balance at beginning of period | 10,923 | 10,923 |
Foreign Currency Translation and Other | 0 | 0 |
Goodwill, Impairment Loss | (2,921) |  |
Balance at end of period | $ 8,002 | $ 10,923 | $ 10,923

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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- Definition Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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- Definition Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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