Annual report pursuant to Section 13 and 15(d)

Property and Equipment (Summary Of Property and Equipment) (Details)

v3.10.0.1
Property and Equipment (Summary Of Property and Equipment) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 148,301 $ 122,316
Accumulated depreciation and amortization (50,022) (47,560)
Total $ 98,279 74,756
Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 5 years  
Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 3 years  
Office Equipment, Furniture And Fixtures And Software[Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 67,632 57,334
Office Equipment, Furniture And Fixtures And Software[Member] | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 14 years  
Office Equipment, Furniture And Fixtures And Software[Member] | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 3 years  
Land, Buildings And Building Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 69,835 56,639
Land, Buildings And Building Improvements [Member] | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 31 years  
Land, Buildings And Building Improvements [Member] | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 3 years  
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 8,444 8,168
Leasehold Improvements [Member] | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 14 years  
Leasehold Improvements [Member] | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 3 years  
Transportation And Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 2,390 $ 175
Property, Plant and Equipment, Useful Life 5 years