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Capital Stock (Details) (USD $)	0 Months Ended								12 Months Ended			0 Months Ended
	Oct. 10, 2013	Aug. 05, 2013	Jul. 11, 2013	Apr. 12, 2013	Jan. 10, 2013	Sep. 19, 2012	May 29, 2012	Apr. 04, 2012	Dec. 31, 2013 vote	Dec. 31, 2012	Dec. 31, 2011	Jan. 10, 2014 Subsequent Event [Member]
Equity [Abstract]
Common stock, shares authorized									400,000,000	400,000,000
Common stock, par value (in dollars per share)									$ 0.01	$ 0.01
Common stock votes									1
Stock repurchase program authorized amount		$ 100,000,000
Preferred stock, shares authorized									10,000,000	10,000,000
Preferred stock, par value (in dollars per share)									$ 0.01	$ 0.01
Preferred Stock, shares outstanding									0	0
Units of Partnership Interest, Amount									0	0
Dividends Payable [Line Items]
Payment Date	Oct. 10, 2013		Jul. 11, 2013	Apr. 12, 2013	Jan. 10, 2013	Sep. 19, 2012	May 29, 2012	Apr. 04, 2012				Jan. 10, 2014
Record Date	Sep. 30, 2013		Jun. 28, 2013	Mar. 28, 2013	Dec. 31, 2012	Sep. 07, 2012	May 15, 2012	Mar. 23, 2012				Dec. 31, 2013
Dividends per common share (in dollars per share)	$ 0.085		$ 0.085	$ 0.085	$ 0.08	$ 0.08	$ 0.08	$ 0.080	$ 0.34	$ 0.32	$ 0.32	$ 0.085

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Aggregate dividends declared during the period for each share of common stock outstanding.

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