Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Preferred Stock, Par or Stated Value Per Share (usd per share)	$ 0.01	$ 0.01
Preferred Stock, Shares Authorized	9,945,539us-gaap_PreferredStockSharesAuthorized	9,765,900us-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 (usd per share)	$ 0.01	$ 0.01
Common Stock, Shares Authorized	200,000,000us-gaap_CommonStockSharesAuthorized	200,000,000us-gaap_CommonStockSharesAuthorized
Common Stock, Shares, Issued	84,240,161us-gaap_CommonStockSharesIssued	83,879,779us-gaap_CommonStockSharesIssued
Common Stock, Shares, Outstanding	84,240,161us-gaap_CommonStockSharesOutstanding	83,879,779us-gaap_CommonStockSharesOutstanding
6.75% Series C Cumulative Redeemable Perpetual Preferred Stock
Preferred Stock, Par or Stated Value Per Share (usd 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 6% Non-Qualified Preferred Stock
Preferred Stock, Par or Stated Value Per Share (usd per share)	$ 0.01	$ 0.01
Preferred Stock, Shares Authorized	0	179,639
Preferred Stock, Shares Issued	0	0
Preferred Stock, Shares Outstanding	0	0

Face amount or stated value per share of common stock.

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