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Leasehold Improvements, Equipment, Construction in Progress and Land, Net (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Leasehold Improvements, Equipment and Construction in Progress, Net      
Leasehold improvements, equipment and construction in progress, gross $ 76,122   $ 73,255
Less accumulated depreciation and amortization (37,582)   (35,152)
Leasehold improvements, equipment and construction in progress, net 38,540   38,103
Land 2,299   2,299
Leasehold improvements, equipment, land and construction in progress, net 40,839   40,402
Depreciation expense 2,860 1,042  
Gains (losses) on sale and abandonment of leasehold improvements and equipment 31 (4)  
Equipment
     
Leasehold Improvements, Equipment and Construction in Progress, Net      
Leasehold improvements, equipment and construction in progress, gross 29,157   28,498
Equipment | Minimum
     
Leasehold Improvements, Equipment and Construction in Progress and Land, Net      
Ranges of Estimated useful life 2 years    
Equipment | Maximum
     
Leasehold Improvements, Equipment and Construction in Progress and Land, Net      
Ranges of Estimated useful life 5 years    
Software
     
Leasehold Improvements, Equipment and Construction in Progress, Net      
Leasehold improvements, equipment and construction in progress, gross 15,610   15,031
Software | Minimum
     
Leasehold Improvements, Equipment and Construction in Progress and Land, Net      
Ranges of Estimated useful life 3 years    
Software | Maximum
     
Leasehold Improvements, Equipment and Construction in Progress and Land, Net      
Ranges of Estimated useful life 10 years    
Vehicles
     
Leasehold Improvements, Equipment and Construction in Progress and Land, Net      
Ranges of Estimated useful life 4 years    
Leasehold Improvements, Equipment and Construction in Progress, Net      
Leasehold improvements, equipment and construction in progress, gross 9,322   9,353
Other
     
Leasehold Improvements, Equipment and Construction in Progress and Land, Net      
Ranges of Estimated useful life 10 years    
Leasehold Improvements, Equipment and Construction in Progress, Net      
Leasehold improvements, equipment and construction in progress, gross 367   367
Leasehold improvements
     
Leasehold Improvements, Equipment and Construction in Progress, Net      
Leasehold improvements, equipment and construction in progress, gross 18,308   17,920
Leasehold improvements | Maximum
     
Leasehold Improvements, Equipment and Construction in Progress and Land, Net      
Ranges of Estimated useful life 10 years    
Construction in progress
     
Leasehold Improvements, Equipment and Construction in Progress, Net      
Leasehold improvements, equipment and construction in progress, gross $ 3,358   $ 2,086