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Equity (Details) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Equity [Abstract]    
Common Stock, shares authorized 200,000 200,000
Common Stock, par value (in dollars per share) $ 0.001 $ 0.001
Preferred Stock, shares authorized 30,000  
Common Stock, shares issued 142,699 140,028
Common Stock, shares outstanding 83,782 81,920
Cumulative Redeemable Preferred Stock    
Preferred Stock Series D, E, F, G and I, liquidation preference per share (in dollars per share) $ 25 $ 25
Shares Issued and Outstanding (in thousands) 21,800 21,800
Number of days in year used in the computation of preferred stock dividends for any partial dividend period 360 days 360 days
Number of months used in the computation of preferred stock dividends for any partial dividend period 12 months 12 months
Number of days in month, dividends computation of dividends payable for any partial dividend period 30 days 30 days
Amount of preferred dividends in arrears $ 0 $ 0
Maximum
    
Cumulative Redeemable Preferred Stock    
Number of days prior to dividend payment date that Board of Directors may elect to designate as the payment date 30 days 30 days
Minimum
    
Cumulative Redeemable Preferred Stock    
Number of days prior to dividend payment date that Board of Directors may elect to designate as the payment date 10 days 10 days
Series D
    
Cumulative Redeemable Preferred Stock    
Shares Issued and Outstanding (in thousands) 4,000 4,000
Par Value (in dollars per share) $ 0.001 $ 0.001
Rate per Annum of the $25.00 Liquidation Preference 8.00% [1],[2] 8.00% [1],[2]
Equivalent to Fixed Annual Rate (per share) $ 2.00 [1],[2] $ 2.00 [1],[2]
Dividends declared and paid 8.0 8.0
Series E
    
Cumulative Redeemable Preferred Stock    
Shares Issued and Outstanding (in thousands) 5,600 5,600
Par Value (in dollars per share) $ 0.001 $ 0.001
Rate per Annum of the $25.00 Liquidation Preference 7.875% [1],[2] 7.875% [1],[2]
Equivalent to Fixed Annual Rate (per share) $ 1.97 [1],[2] $ 1.97 [1],[2]
Dividends declared and paid 11.0 11.0
Series F
    
Cumulative Redeemable Preferred Stock    
Shares Issued and Outstanding (in thousands) 4,000 4,000
Par Value (in dollars per share) $ 0.001 $ 0.001
Rate per Annum of the $25.00 Liquidation Preference 7.80% [1],[2] 7.80% [1],[2]
Equivalent to Fixed Annual Rate (per share) $ 1.95 [1],[2] $ 1.95 [1],[2]
Dividends declared and paid 7.8 7.8
Series G
    
Cumulative Redeemable Preferred Stock    
Shares Issued and Outstanding (in thousands) 3,200 3,200
Par Value (in dollars per share) $ 0.001 $ 0.001
Rate per Annum of the $25.00 Liquidation Preference 7.65% [1],[2] 7.65% [1],[2]
Equivalent to Fixed Annual Rate (per share) $ 1.91 [1],[2] $ 1.91 [1],[2]
Dividends declared and paid 6.1 6.1
Series I
    
Cumulative Redeemable Preferred Stock    
Shares Issued and Outstanding (in thousands) 5,000 5,000
Par Value (in dollars per share) $ 0.001 $ 0.001
Rate per Annum of the $25.00 Liquidation Preference 7.50% [1],[2] 7.50% [1],[2]
Equivalent to Fixed Annual Rate (per share) $ 1.88 [1],[2] $ 1.88 [1],[2]
Dividends declared and paid $ 9.4 $ 9.4
[1] Holders of shares of the Series D, E, F, G and I preferred stock are entitled to receive dividends, when and as declared by the Board of Directors, out of funds legally available for the payment of dividends. Dividends are cumulative from the date of original issue and are payable quarterly in arrears on or before the 15th day of each March, June, September and December or, if not a business day, the next succeeding business day. Any dividend payable on the preferred stock for any partial dividend period will be computed on the basis of a 360-day year consisting of twelve 30-day months. Dividends will be payable to holders of record as of the close of business on the first day of the calendar month in which the applicable dividend payment date falls or on another date designated by the Board of Directors of the Company for the payment of dividends that is not more than 30 nor less than 10 days prior to the dividend payment date.
[2] The Company declared and paid dividends of $8.0 million, $11.0 million, $7.8 million, $6.1 million and $9.4 million on its Series D, E, F, G and I preferred stock, respectively, during each of the years ended December 31, 2012 and 2011, all of which qualified as return of capital for tax reporting purposes. There are no dividend arrearages on any of the preferred shares currently outstanding.