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Property and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Property and Equipment [Abstract]      
Property and equipment, gross $ 666,130 $ 636,711  
Less: accumulated depreciation (211,593) (171,928)  
Property and equipment, net 454,537 464,783  
Depreciation expense 61,600 46,500 $ 27,100
Land [Member]      
Property and Equipment [Abstract]      
Property and equipment, gross 33,610 34,087  
Buildings [Member]      
Property and Equipment [Abstract]      
Property and equipment, gross 272,208 230,934  
Construction in Progress [Member]      
Property and Equipment [Abstract]      
Property and equipment, gross 7,827 63,941  
Furniture and Fixtures [Member]      
Property and Equipment [Abstract]      
Property and equipment, gross 81,274 61,643  
Computers and Equipment [Member]      
Property and Equipment [Abstract]      
Property and equipment, gross 141,079 118,248  
Leasehold Improvements [Member]      
Property and Equipment [Abstract]      
Property and equipment, gross 116,120 110,539  
Scanners [Member]      
Property and Equipment [Abstract]      
Property and equipment, gross 11,805 14,594  
Vehicles [Member]      
Property and Equipment [Abstract]      
Property and equipment, gross $ 2,207 $ 2,725