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Property and Equipment Table (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Property, Plant and Equipment [Line Items] |  |
Leasehold improvements | $ 21,975 | $ 22,199
Office furniture and equipment | 6,102 | 6,117
Total cost | 108,231 | 103,490
Accumulated depreciation | (70,561) | (64,210)
Property and equipment, net | 37,670 | 39,280
Computer Equipment [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Other, Gross | 62,303 | 57,277
Transportation Equipment [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Other, Gross | $ 17,851 | $ 17,897
Minimum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment, useful Life | 1 year |
Minimum [Member] | Computer Equipment [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment, useful Life | 1 year |
Minimum [Member] | Transportation Equipment [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment, useful Life | 3 years |
Minimum [Member] | Office Furniture and Equipment [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment, useful Life | 4 years |
Maximum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment, useful Life | 15 years |
Maximum [Member] | Computer Equipment [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment, useful Life | 10 years |
Maximum [Member] | Transportation Equipment [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment, useful Life | 12 years |
Maximum [Member] | Office Furniture and Equipment [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment, useful Life | 15 years |

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- Definition Amount before accumulated depreciation of equipment commonly used in offices and stores that have no permanent connection to the structure of a building or utilities. Examples include, but are not limited to, desks, chairs, tables, and bookcases. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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- Definition Amount before accumulated depreciation of additions or improvements to assets held under a lease arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6812-107765 + Details
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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://www.xbrl.org/2003/role/presentationRef -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/2003/role/presentationRef -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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