Equity and Equity-Based Compensation (At-the-Market Preferred Stock Offering) (Narrative) (Details) (USD $)
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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 | |||||||
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Jun. 30, 2013
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Jun. 30, 2012
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Jun. 20, 2013
Common Stock
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Jun. 30, 2013
Series A Preferred Stock [Member]
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Jun. 30, 2012
Series A Preferred Stock [Member]
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Jun. 30, 2013
Series D Preferred Stock [Member]
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Jun. 30, 2012
Series D Preferred Stock [Member]
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Mar. 02, 2012
At-the-Market Preferred Stock Offering [Member]
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Jun. 30, 2012
At-the-Market Preferred Stock Offering [Member]
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Jun. 30, 2013
At-the-Market Preferred Stock Offering [Member]
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Jun. 30, 2012
At-the-Market Preferred Stock Offering [Member]
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Mar. 02, 2012
At-the-Market Preferred Stock Offering [Member]
Series A Preferred Stock [Member]
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Jun. 30, 2013
At-the-Market Preferred Stock Offering [Member]
Series A Preferred Stock [Member]
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Jun. 30, 2012
At-the-Market Preferred Stock Offering [Member]
Series A Preferred Stock [Member]
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Jun. 30, 2013
At-the-Market Preferred Stock Offering [Member]
Series A Preferred Stock [Member]
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Jun. 30, 2012
At-the-Market Preferred Stock Offering [Member]
Series A Preferred Stock [Member]
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Mar. 02, 2012
At-the-Market Preferred Stock Offering [Member]
Series D Preferred Stock [Member]
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Jun. 30, 2013
At-the-Market Preferred Stock Offering [Member]
Series D Preferred Stock [Member]
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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 |