CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Mar. 31, 2014	Dec. 31, 2013
Preferred stock, Series C Cumulative Convertible Redeemable Preferred Stock, shares outstanding (in shares)	0	0
Preferred stock, 8.0% Cumulative Redeemable Preferred Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, 8.0% Cumulative Redeemable Preferred Stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	500,000,000	500,000,000
Common stock, shares issued (in shares)	181,355,803	180,858,699
Common stock, shares outstanding (in shares)	181,355,803	180,858,699