Annual report pursuant to Section 13 and 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)

v3.6.0.2
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Advertising cost        
Advertising $ 61,258 $ 57,705 $ 54,909  
Cash and Cash Equivalents        
Maximum original maturity period of cash equivalents 3 months      
Cash held at various banking institutions $ 142,785 134,574 $ 108,372 $ 118,216
Cash held in non-interest-bearing accounts 88,400      
Cash held in foreign bank accounts $ 54,424 $ 34,816