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Property and Equipment - Property and Equipment (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Property Plant And Equipment [Line Items] |  |
Property and equipment, gross | $ 129,414 | $ 116,610
Accumulated depreciation and amortization | (81,309) | (78,558)
Total property and equipment, net | 48,105 | 38,052
Leasehold Improvements |  |
Property Plant And Equipment [Line Items] |  |
Property and equipment, gross | 19,444 | 18,873
Software and Software Development Costs |  |
Property Plant And Equipment [Line Items] |  |
Property and equipment, gross | 50,967 | 42,835
Furniture and Fixtures |  |
Property Plant And Equipment [Line Items] |  |
Property and equipment, gross | 27,435 | 26,076
Computer Equipment |  |
Property Plant And Equipment [Line Items] |  |
Property and equipment, gross | $ 31,568 | $ 28,826

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- Definition Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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