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Dividends (Details) (USD $)
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dividends Payable [Line Items]                        
Dividends Payable, Amount Per Share $ 0.075us-gaap_DividendsPayableAmountPerShare $ 0.075us-gaap_DividendsPayableAmountPerShare $ 0.075us-gaap_DividendsPayableAmountPerShare $ 0.075us-gaap_DividendsPayableAmountPerShare $ 0.075us-gaap_DividendsPayableAmountPerShare $ 0.075us-gaap_DividendsPayableAmountPerShare $ 0.075us-gaap_DividendsPayableAmountPerShare $ 0.075us-gaap_DividendsPayableAmountPerShare $ 0.075us-gaap_DividendsPayableAmountPerShare $ 0.075us-gaap_DividendsPayableAmountPerShare $ 0.075us-gaap_DividendsPayableAmountPerShare $ 0.075us-gaap_DividendsPayableAmountPerShare