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Shareholders' Equity Tax Characteristics of Cash Dividend (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Equity [Abstract]      
Capital gain $ 0.72 $ 1.68 $ 1.52
Qualified $ 1.14 $ 0 $ 0
Non-taxable return of capital $ 0 $ 0 $ 0
Total cash dividend per common share $ 1.86 $ 1.68 $ 1.52