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SUBSEQUENT EVENTS (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 0 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Apr. 28, 2015
Apr. 01, 2015
SUBSEQUENT EVENT        
Dividend paid in cash $ 3,894us-gaap_PaymentsOfDividendsCommonStock $ 3,874us-gaap_PaymentsOfDividendsCommonStock    
Subsequent event        
SUBSEQUENT EVENT        
Quarterly dividend declared (in dollars per share)       $ 0.18us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Dividend paid in cash     $ 3,900us-gaap_PaymentsOfDividendsCommonStock
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember