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Equity (Preferred Stock) (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Maximum
Dec. 31, 2012
Maximum
Dec. 31, 2013
Minimum
Dec. 31, 2012
Minimum
Dec. 31, 2013
Series D
Dec. 31, 2012
Series D
Dec. 31, 2013
Series E
Dec. 31, 2012
Series E
Dec. 31, 2013
Series F
Dec. 31, 2012
Series F
Dec. 31, 2013
Series G
Dec. 31, 2012
Series G
Dec. 31, 2013
Series I
Dec. 31, 2012
Series I
Dec. 31, 2013
Series J Preferred Stock
Mar. 31, 2013
Series J Preferred Stock
Dec. 31, 2012
Series J Preferred Stock
Equity [Abstract]                                      
Common Stock, shares authorized 200,000,000 200,000,000                                  
Common Stock, par value (in dollars per share) $ 0.001 $ 0.001                                  
Preferred Stock, shares authorized 30,000,000.0                                    
Common Stock, shares issued 144,334,000 142,699,000                                  
Common Stock, shares outstanding 83,717,000 83,782,000                                  
Class of Stock [Line Items]                                      
Shares Issued and Outstanding (in thousands) 25,800,000 21,800,000         4,000,000 4,000,000 5,600,000 5,600,000 4,000,000 4,000,000 3,200,000 3,200,000 5,000,000 5,000,000 4,000,000    
Par Value (in dollars per share)             $ 0.001 $ 0.001 $ 0.001 $ 0.001 $ 0.001 $ 0.001 $ 0.001 $ 0.001 $ 0.001 $ 0.001 $ 0.001    
Preferred Stock, par value (in dollars per share)             $ 25 [1],[2] $ 25.00 $ 25 [1],[2] $ 25.00 $ 25 [1],[2] $ 25.00 $ 25 [1],[2] $ 25.00 $ 25 [1],[2] $ 25.00 $ 50 [1],[2]   $ 0
Rate per Annum             8.00% [1],[2] 8.00% [1],[2] 7.875% [1],[2] 7.875% [1],[2] 7.80% [1],[2] 7.80% [1],[2] 7.65% [1],[2] 7.65% [1],[2] 7.50% [1],[2] 7.50% [1],[2] 4.50% [1],[2]    
Equivalent to Fixed Annual Rate (per share)             $ 2.00 [1],[2] $ 2.00 $ 1.97 [1],[2] $ 1.97 $ 1.95 [1],[2] $ 1.95 $ 1.91 [1],[2] $ 1.91 $ 1.88 [1],[2] $ 1.88 $ 2.25 [1],[2]    
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                                  
Number of days prior to dividend payment date that Board of Directors may elect to designate as the payment date     30 days 30 days 10 days 10 days                          
Dividends declared and paid             $ 8,000,000 $ 8,000,000 $ 11,000,000 $ 11,000,000 $ 7,800,000 $ 7,800,000 $ 6,100,000 $ 6,100,000 $ 9,400,000 $ 9,400,000 $ 6,700,000    
Amount of preferred dividends in arrears 0 0                                  
Preferred stock, value, public offering shares issued                                   $ 200,000,000.0  
Convertible preferred stock, shares issued upon conversion                                   3.9087  
Convertible preferred stock, conversion price (in dollars per share)                                   $ 12.79  
Preferred stock, liquidation redemption price, percent of liquidation preference                                   100.00%  
[1] 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, 2013 and 2012. The Company also declared and paid dividends of $6.7 million on its Series J preferred stock during the year ended December 31, 2013. All of the dividends qualified as return of capital for tax reporting purposes. There are no dividend arrearages on any of the preferred shares currently outstanding.
[2] Holders of shares of the Series D, E, F, G, I and J 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.