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Subsequent Event (Details) (Subsequent event, USD $)
 0 Months Ended 12 Months Ended
Jan. 29, 2015
Dec. 31, 2014
Subsequent event
    
Subsequent event    
Quarterly cash dividend (in dollars per share) $ 0.125us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		  
Dividends payable date declared   Jan. 29, 2015
Dividends payable date of record   Feb. 27, 2015
Dividends payable date to be paid   Mar. 19, 2015