Equity Transactions (Details) (USD $)	12 Months Ended	3 Months Ended	12 Months Ended		3 Months Ended	12 Months Ended		3 Months Ended		12 Months Ended
	Dec. 31, 2013	Jun. 30, 2011 7.125% Series H Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2013 7.125% Series H Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2012 7.125% Series H Cumulative Redeemable Preferred Stock [Member]	Sep. 30, 2006 4.875% Series G Cumulative Convertible Preferred Stock [Member]	Dec. 31, 2013 4.875% Series G Cumulative Convertible Preferred Stock [Member]	Dec. 31, 2012 4.875% Series G Cumulative Convertible Preferred Stock [Member]	Jun. 30, 2011 7.875% Series B Cumulative Redeemable Preferred Units [Member]	Jun. 30, 2011 7.8125% Series F Preferred Stock [Member]	Dec. 31, 2013 Common Stock [Member]	Dec. 31, 2012 Common Stock [Member]	Dec. 31, 2011 Common Stock [Member]	Dec. 31, 2013 Operating Partnership Units [Member]	Dec. 31, 2013 Long Term Incentive Plan "LTIP" Units [Member]
Class of Stock [Line Items]
Cumulative dividend rate (in hundredths)			7.125%	7.125%		4.875%	4.875%	7.875%	7.8125%
Issue date			Apr. 30, 2011	Apr. 30, 2011		Jul. 31, 2006	Jul. 31, 2006
Shares Authorized (in shares)			8,000,000	8,000,000		5,980,000	5,980,000
Shares Outstanding (in shares)			2,950,000	2,950,000		178,249	178,249						2,031,612	118,190
Liquidation Preference			$ 73,750,000	$ 73,750,000		$ 4,456,000	$ 4,456,000
Shares issued (in shares)		2,950,000								913,344	2,400,000	2,400,000
Issue price (in dollars per share)		$ 25.00								$ 152.92
Net proceeds		71,200,000								138,400,000	357,700,000	323,900,000
Beginning date of called period		Apr. 13, 2016
Liquidation value								80,000,000	25,000,000				308,500,000
Excess of cash paid over carrying value								1,000,000	900,000
Number of shares sold (in shares)					5,980,000
Gross proceeds from sale of shares					$ 149,500,000
Conversion rate into shares of common stock (in shares)					0.1830
Liquidation preference per share (in dollars per share)					$ 25
Initial conversion price per share of common stock (in dollars per share)					$ 136.62
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest	94.60%												94.60%