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Equity and Equity-Based Compensation (At-the-Market Preferred Stock Offering) (Narrative) (Details) (USD $)
6 Months Ended 0 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended 6 Months Ended 0 Months Ended 3 Months Ended 6 Months Ended 0 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 20, 2013
Common Stock
Jun. 30, 2013
Series A Preferred Stock [Member]
Jun. 30, 2012
Series A Preferred Stock [Member]
Jun. 30, 2013
Series D Preferred Stock [Member]
Jun. 30, 2012
Series D Preferred Stock [Member]
Mar. 02, 2012
At-the-Market Preferred Stock Offering [Member]
Jun. 30, 2012
At-the-Market Preferred Stock Offering [Member]
Jun. 30, 2013
At-the-Market Preferred Stock Offering [Member]
Jun. 30, 2012
At-the-Market Preferred Stock Offering [Member]
Mar. 02, 2012
At-the-Market Preferred Stock Offering [Member]
Series A Preferred Stock [Member]
Jun. 30, 2013
At-the-Market Preferred Stock Offering [Member]
Series A Preferred Stock [Member]
Jun. 30, 2012
At-the-Market Preferred Stock Offering [Member]
Series A Preferred Stock [Member]
Jun. 30, 2013
At-the-Market Preferred Stock Offering [Member]
Series A Preferred Stock [Member]
Jun. 30, 2012
At-the-Market Preferred Stock Offering [Member]
Series A Preferred Stock [Member]
Mar. 02, 2012
At-the-Market Preferred Stock Offering [Member]
Series D Preferred Stock [Member]
Jun. 30, 2013
At-the-Market Preferred Stock Offering [Member]
Series D Preferred Stock [Member]
Class of Stock [Line Items]                                    
Shares issued (in dollars per share)     $ 12.00                              
Term of option to purchase additional stock     30 days                              
Additional shares authorized for purchase (in shares)     1,650,000                              
Stock issuance costs     $ 125,900,000                              
Shares issued (in shares)     11,000,000                              
Proceeds from issuance of stock     132,000,000                              
Preferred stock, shares pursuant to the underwriters (in shares)                       700,000         700,000  
Percentage of preferred stock shares       8.55% 8.55% 8.45% 8.45%         8.55%     8.55% 8.45% 8.45%  
Market price of cumulative preferred stock               30,000,000                    
At-the-market preferred shares issued (in shares)                   0     48,575 252,227 169,306 501,909   0
Net proceeds from issuance of preferred stock 244,000 15,983,000                     1,200,000 6,200,000 4,200,000 12,300,000    
ATM proceeds, net of commissions and other expenses                 $ 7,300,000   $ 16,000,000