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Valuation Fair Value, Other Financial Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents $ 46,025 $ 56,117 $ 37,509 $ 33,504
Due from brokers 32,061 26,754    
Reverse repurchase agreements [1] 44,617 81,461    
Repurchase agreements [1] 1,589,319 1,597,206    
Due to brokers 1,025 489    
Estimate of Fair Value Measurement [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and Cash Equivalents 46,025 56,117    
Due from brokers 32,061 26,754    
Reverse repurchase agreements 44,617 81,461    
Repurchase agreements 1,589,319 1,597,206    
Due to brokers 1,025 489    
Reported Value Measurement [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents 46,025 56,117    
Due from brokers 32,061 26,754    
Reverse repurchase agreements 44,617 81,461    
Repurchase agreements 1,589,319 1,597,206    
Due to brokers $ 1,025 $ 489    
[1] In the Company's Consolidated Balance Sheet, all balances associated with the repurchase agreements and financial derivatives are presented on a gross basis.