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PROPERTY AND EQUIPMENT, Net (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Property and equipment, net    
Property and equipment, gross $ 168,433 $ 152,466
Less: accumulated depreciation and amortization (79,946) (64,323)
Property and equipment, net 88,487 88,143
Land
   
Property and equipment, net    
Property and equipment, gross 5,382 5,382
Leasehold improvements
   
Property and equipment, net    
Property and equipment, gross 2,791 2,222
Furniture and fixtures
   
Property and equipment, net    
Property and equipment, gross 3,451 3,474
Office and computer equipment
   
Property and equipment, net    
Property and equipment, gross 14,899 14,135
Computer software
   
Property and equipment, net    
Property and equipment, gross 563 791
Equipment
   
Property and equipment, net    
Property and equipment, gross 73,614 62,552
Building
   
Property and equipment, net    
Property and equipment, gross 38,382 33,468
Vehicles
   
Property and equipment, net    
Property and equipment, gross $ 29,351 $ 30,442