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Furniture, Equipment and Leasehold Improvements (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Property, Plant and Equipment [Line Items] |  |  |
Depreciation, Depletion and Amortization | $ 24,640 | $ 22,946 | $ 17,855
Hosting Arrangement, Service Contract, Implementation Cost, Capitalized, before Accumulated Amortization | 7,033 |  |
Leasehold Improvements |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Asset Impairment Charges | 480 |  |
Special Charges [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Depreciation, Depletion and Amortization | 3,320 | $ 4,370 | $ 2,058
Asset Impairment Charges | $ 1,656 |  |

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- Definition Amount, before accumulated amortization, of capitalized implementation cost from hosting arrangement that is service contract. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 40 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=118198657&loc=SL118198666-228104 + Details
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