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SUBSEQUENT EVENT (Details) (Subsequent Events, USD $)
 0 Months Ended
Feb. 03, 2015
Apr. 27, 2015
Subsequent Event    
Cash dividend declared (in dollars per share) $ 0.20us-gaap_CommonStockDividendsPerShareDeclared  
Class A common stock    
Subsequent Event    
Cash dividend declared (in dollars per share)   $ 0.20us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Class B common stock    
Subsequent Event    
Cash dividend declared (in dollars per share)   $ 0.20us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember