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Valuation Fair Value, Other Financial Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents $ 41,242 $ 40,166 $ 53,340 $ 45,237
Due from brokers 30,206 33,297    
Reverse repurchase agreements [1] 69,575 78,632    
Repurchase agreements [1] 1,133,841 1,222,719    
Due to brokers 127 439    
Estimate of Fair Value Measurement [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and Cash Equivalents 41,242 40,166    
Due from brokers 30,206 33,297    
Reverse repurchase agreements 69,575 78,632    
Repurchase agreements 1,133,841 1,222,719    
Due to brokers 127 439    
Reported Value Measurement [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents 41,242 40,166    
Due from brokers 30,206 33,297    
Reverse repurchase agreements 69,575 78,632    
Repurchase agreements 1,133,841 1,222,719    
Due to brokers $ 127 $ 439    
[1] In the Company's Consolidated Balance Sheet, all balances associated with the repurchase agreements and financial derivatives are presented on a gross basis.