Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Preferred stock, par value	$ 0.01	$ 0.01
Preferred Stock, Shares Authorized	9,765,900us-gaap_PreferredStockSharesAuthorized	9,765,525us-gaap_PreferredStockSharesAuthorized
Preferred Stock, Shares Issued	0us-gaap_PreferredStockSharesIssued	0us-gaap_PreferredStockSharesIssued
Preferred stock, shares outstanding	0us-gaap_PreferredStockSharesOutstanding	0us-gaap_PreferredStockSharesOutstanding
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Common stock, shares authorized	200,000,000us-gaap_CommonStockSharesAuthorized	200,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued	83,879,779us-gaap_CommonStockSharesIssued	83,313,677us-gaap_CommonStockSharesIssued
Common stock, shares outstanding	83,879,779us-gaap_CommonStockSharesOutstanding	83,313,677us-gaap_CommonStockSharesOutstanding
Cumulative Series C Six Point Seven Five Percent Redeemable Perpetual Preferred Stock [Member]
Preferred stock, par value	$ 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 value	$ 0.01	$ 0.01
Preferred Stock, Shares Authorized	179,639	179,764
Preferred Stock, Shares Issued	0	125
Preferred stock, shares outstanding	0	125
Cumulative Series E Eighteen Point Seventy Five Percent Non-Voting Preferred Stock [Member]
Preferred stock, par value	$ 0.01	$ 0.01
Preferred Stock, Shares Authorized	0	250
Preferred Stock, Shares Issued	0	250
Preferred stock, shares outstanding	0	250

Face amount or stated value per share of common stock.

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