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Equity (Preferred Stock) (Details) (USD $)
 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2014
Maximum
Dec. 31, 2013
Maximum
Mar. 31, 2014
Minimum
Dec. 31, 2013
Minimum
Mar. 31, 2014
Series D
Mar. 31, 2013
Series D
Dec. 31, 2013
Series D
Mar. 31, 2014
Series E
Mar. 31, 2013
Series E
Dec. 31, 2013
Series E
Mar. 31, 2014
Series F
Mar. 31, 2013
Series F
Dec. 31, 2013
Series F
Mar. 31, 2014
Series G
Mar. 31, 2013
Series G
Dec. 31, 2013
Series G
Mar. 31, 2014
Series I
Mar. 31, 2013
Series I
Dec. 31, 2013
Series I
Mar. 31, 2013
Series J Preferred Stock
Mar. 31, 2014
Series J Preferred Stock
Dec. 31, 2013
Series J Preferred Stock
Class of Stock [Line Items]                                                
Shares Issued and Outstanding (in thousands) 25,800,000 25,800,000         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 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 $ 0.001
Liquidation Preference (in dollars per share)             $ 25 [1],[2]   $ 25 [1],[2] $ 25 [1],[2]   $ 25 [1],[2] $ 25 [1],[2]   $ 25 [1],[2] $ 25 [1],[2]   $ 25 [1],[2] $ 25 [1],[2]   $ 25 [1],[2] $ 50.00 [1],[2] $ 50 [1],[2] $ 50 [1],[2]
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% 4.50% [1],[2] 4.50% [1],[2]
Equivalent to Fixed Annual Rate (per share)             $ 2.00 [1],[2]   $ 2.00 [1],[2] $ 1.97 [1],[2]   $ 1.97 [1],[2] $ 1.95 [1],[2]   $ 1.95 [1],[2] $ 1.91 [1],[2]   $ 1.91 [1],[2] $ 1.88 [1],[2]   $ 1.88 [1],[2]   $ 2.25 [1],[2] $ 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             $ 2,000,000 $ 2,000,000   $ 2,800,000 $ 2,800,000   $ 2,000,000 $ 2,000,000   $ 1,500,000 $ 1,500,000   $ 2,300,000 $ 2,300,000     $ 2,300,000  
Amount of preferred dividends in arrears 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 $2.0 million, $2.8 million, $2.0 million, $1.5 million and $2.3 million on its Series D, E, F, G and I preferred stock during the three months ended March 31, 2014 and 2013. The Company declared and paid dividends of $2.3 million on its Series J preferred stock during the three months ended March 31, 2014. 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.