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Shareholders' Equity Cash Dividends Declared Per Common Share (Details) (USD $)
3 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2012
Dec. 31, 2014
Dec. 31, 2013
Disclosure Shareholders Equity [Abstract]        
Quarterly dividend declared and paid per common share $ 0.48us-gaap_CommonStockDividendsPerShareCashPaid $ 0.42us-gaap_CommonStockDividendsPerShareCashPaid $ 1.92us-gaap_CommonStockDividendsPerShareCashPaid $ 1.68us-gaap_CommonStockDividendsPerShareCashPaid