v2.4.0.8
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 2) (USD $)
 3 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2013
Dec. 31, 2011
Dec. 31, 2012
Property and equipment        
Maturity period from date of purchase, short-term investments classified as cash equivalents, less than (in days)   91 days    
Capitalized software costs written-off $ 2,700,000   $ 4,900,000  
Net book value   293,964,000   270,512,000
Buildings and leasehold improvements | Minimum
        
Property and equipment        
Estimated useful lives, minimum (in years)   3 years    
Buildings and leasehold improvements | Maximum
        
Property and equipment        
Estimated useful lives, minimum (in years)   39 years    
Capitalized internal use software
        
Property and equipment        
Net book value   $ 30,900,000   $ 33,400,000
Capitalized internal use software | Minimum
        
Property and equipment        
Estimated useful lives, minimum (in years)   2 years    
Capitalized internal use software | Maximum
        
Property and equipment        
Estimated useful lives, minimum (in years)   3 years    
Furniture and other equipment | Minimum
        
Property and equipment        
Estimated useful lives, minimum (in years)   3 years    
Furniture and other equipment | Maximum
        
Property and equipment        
Estimated useful lives, minimum (in years)   10 years