Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Preferred Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Preferred Stock, Shares Authorized	9,945,164	9,945,164
Preferred Stock, Shares Issued	0	0
Preferred Stock, Shares Outstanding	0	0
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Preferred Stock, Value, Issued	$ 0	$ 0
Common Stock, Shares Authorized	200,000,000	200,000,000
Common Stock, Shares, Issued	83,324,703	83,313,677
Common Stock, Shares, Outstanding	83,324,703	83,313,677
Cumulative Series C Six Point Seven Five Percent Redeemable Perpetual Preferred Stock [Member]
Preferred Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Preferred Stock, Shares Authorized	54,461	54,461
Preferred Stock, Shares Issued	54,458	54,458
Preferred Stock, Shares Outstanding	54,458	54,458
Cumulative Series D Six Percent Non-Qualified Preferred Stock [Member]
Preferred Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Preferred Stock, Shares Authorized	125	125
Preferred Stock, Shares Issued	125	125
Preferred Stock, Shares Outstanding	125	125
Cumulative Series E Eighteen Point Seven Five Percent Nonvoting Preferred Stock [Member]
Preferred Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Preferred Stock, Shares Authorized	250	250
Preferred Stock, Shares Issued	250	250
Preferred Stock, Shares Outstanding	250	250