Annual report pursuant to Section 13 and 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Advertising cost        
Advertising $ 55,282 $ 48,909 $ 46,081  
Cash and Cash Equivalents        
Maximum original maturity period of cash equivalents 3 months      
Cash held at various banking institutions 118,216 65,082 46,275 20,913
Cash held in non-interest-bearing accounts 67,200      
Cash held in foreign bank accounts $ 51,012 $ 40,933