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Property (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 33,641 $ 33,031
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment (30,412) (29,202)
Property at cost, net of depreciation 3,229 3,829
Software and Software Development Costs [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 5,542 5,194
Furniture and Fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 6,252 6,191
Other Capitalized Property Plant and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 11,196 11,008
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 10,651 $ 10,638