Annual report pursuant to Section 13 and 15(d)

Equity Securities, at Fair Value Equity Securities (Details)

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Equity Securities, at Fair Value Equity Securities (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2012
Dec. 19, 2012
Dec. 31, 2011
Schedule of Equity Securities [Line Items]      
Equity Securities, Shares   17,824,647  
Investment in Common Stock of Silver Bay, Ownership Percentage   47.70%  
Equity Securities, Cost Basis $ 329,756    
Equity Securities, Gross Unrealized Gain (Loss) 5,882    
Equity securities, at fair value $ 335,638   $ 0
Initial Public Offering of Silver Bay Common Stock, Price Per Share   $ 18.50