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Property and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross $ 38,268 $ 51,808  
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment (16,150) (22,413)  
Property, Plant and Equipment, Net 22,118 29,395  
Assets Held-for-sale, Not Part of Disposal Group   5,600  
Depreciation Expense 5,900 5,600 $ 4,100
Land, Buildings and Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 0 11,824  
Office furnishings, leasehold improvements, computer equipment and computer software      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 28,207 29,920  
Transportation and construction equipment      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross $ 10,061 $ 10,064