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Derivative Instruments Schedule of TBA Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Derivative [Line Items]    
Financial derivatives–assets, at fair value [1] $ 13,528 $ 8,792
Financial derivatives–liabilities, at fair value [1] (5,876) (1,863)
Derivative, Fair Value, Net 7,652 6,929
TBA securities- purchase contracts [Member]    
Derivative [Line Items]    
Derivative notional [2] 139,704 113,144
Derivative cost basis [3] 142,712 117,635
Market Value, Underyling [4] 142,885 117,395
Derivative, Fair Value, Net [5] 173 (240)
TBA securities- sale contracts [Member]    
Derivative [Line Items]    
Derivative notional [2] (382,253) (686,855)
Derivative cost basis [3] (383,724) (713,353)
Market Value, Underyling [4] (386,173) (713,446)
Derivative, Fair Value, Net [5] (2,449) (93)
TBA securities [Member]    
Derivative [Line Items]    
Derivative notional, net [2] (242,549) (573,711)
Derivative cost basis [3] (241,012) (595,718)
Market Value, Underyling [4] (243,288) (596,051)
Derivative, Fair Value, Net [5] (2,276) (333)
Derivative Financial Instruments, Assets [Member] | TBA securities- purchase contracts [Member]    
Derivative [Line Items]    
Derivative notional [2] 98,555 37,355
Derivative cost basis [3] 99,949 38,065
Market Value, Underyling [4] 100,244 38,091
Financial derivatives–assets, at fair value [5] 295 26
Derivative Financial Instruments, Assets [Member] | TBA securities- sale contracts [Member]    
Derivative [Line Items]    
Derivative notional [2] (3,600) (358,279)
Derivative cost basis [3] (3,770) (372,219)
Market Value, Underyling [4] (3,769) (371,843)
Financial derivatives–assets, at fair value [5] 1 376
Derivative Financial Instruments, Liabilities [Member] | TBA securities- purchase contracts [Member]    
Derivative [Line Items]    
Derivative notional [2] 41,149 75,789
Derivative cost basis [3] 42,763 79,570
Market Value, Underyling [4] 42,641 79,304
Financial derivatives–liabilities, at fair value [5] (122) (266)
Derivative Financial Instruments, Liabilities [Member] | TBA securities- sale contracts [Member]    
Derivative [Line Items]    
Derivative notional [2] (378,653) (328,576)
Derivative cost basis [3] (379,954) (341,134)
Market Value, Underyling [4] (382,404) (341,603)
Financial derivatives–liabilities, at fair value [5] $ (2,450) $ (469)
[1] In the Company's Consolidated Balance Sheet, all balances associated with the repurchase agreements and financial derivatives are presented on a gross basis.
[2] Notional amount represents the principal balance of the underlying Agency RMBS.
[3] Cost basis represents the forward price to be paid (received) for the underlying Agency RMBS.
[4] Market value represents the current market value of the underlying Agency RMBS (on a forward delivery basis) as of period end.
[5] Net carrying value represents the difference between the market value of the TBA contract as of period end and the cost basis and is reported in Financial derivatives-assets at fair value and Financial derivatives-liabilities at fair value on the Consolidated Balance Sheet.