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Property and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 230,255 $ 219,734
Accumulated depreciation and amortization (157,131) (142,595)
Property and equipment, net 73,124 77,139
Leasehold improvements reimbursed by lessors as lease incentives 300 2,900
Fixed assets written off 3,200 13,300
Land [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 7,138 7,138
Building and Building Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 19,238 19,109
Furniture Equipment And Computer Hardware And Software [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 157,104 150,597
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 39,769 38,639
Construction in progress [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 7,006 $ 4,251
Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful life of property and equipment 40 years  
Maximum [Member] | Building and Building Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful life of property and equipment 40 years  
Maximum [Member] | Furniture Equipment And Computer Hardware And Software [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful life of property and equipment 10 years  
Maximum [Member] | Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful life of property and equipment 10 years  
Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful life of property and equipment 3 years  
Minimum [Member] | Building and Building Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful life of property and equipment 5 years  
Minimum [Member] | Furniture Equipment And Computer Hardware And Software [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful life of property and equipment 5 years  
Minimum [Member] | Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful life of property and equipment 3 years