Summary of Significant Accounting Policies (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Dividends Payable [Line Items]
Common Stock, Dividends, Per Share, Declared	$ 1.64	$ 1.60	$ 1.60
Ordinary Income [Member]
Dividends Payable [Line Items]
Common Stock, Dividends, Per Share, Declared	$ 1.372	$ 1.200	$ 1.570
Return Of Capital [Member]
Dividends Payable [Line Items]
Common Stock, Dividends, Per Share, Declared	$ 0.268	$ 0.400	$ 0.030