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FIXED ASSETS (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
FIXED ASSETS      
Depreciation of fixed assets $ 28,848 $ 27,283 $ 23,516
Fixed assets, gross 315,778 314,860  
Less: accumulated depreciation (186,435) (180,308)  
Total fixed assets, net 129,343 134,552  
Write-off of fully depreciated assets 23,600    
Computer hardware and software, including internal-use software and website development      
FIXED ASSETS      
Fixed assets, gross 196,501 196,923  
Building      
FIXED ASSETS      
Fixed assets, gross 69,169 67,892  
Furniture and equipment      
FIXED ASSETS      
Fixed assets, gross 14,455 15,931  
Land      
FIXED ASSETS      
Fixed assets, gross 12,781 12,781  
Building machinery and equipment      
FIXED ASSETS      
Fixed assets, gross 8,356 7,915  
Leasehold improvements      
FIXED ASSETS      
Fixed assets, gross 7,752 7,062  
Land improvements      
FIXED ASSETS      
Fixed assets, gross 6,764 6,356  
Equipment under capital leases      
FIXED ASSETS      
Depreciation of fixed assets 3,500 4,100 $ 1,600
Fixed assets, gross 1,800 21,500  
Less: accumulated depreciation $ (500) $ (8,700)