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DERIVATIVE INSTRUMENTS (Tables) | 12 Months Ended
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Dec. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Summarizes Fair Value Information about Derivative Assets Liabilities | The table below summarizes fair value information about our derivative assets and liabilities at December 31, 2019 and 2018:
Derivatives Instruments |  | December 31, 2019 |  | December 31, 2018
Assets |  | (dollars in thousands)
Interest rate swaps |  | $ | 1,199 |  |  | $ | 48,114 |
Interest rate swaptions |  | 11,580 |  |  | 7,216 |
TBA derivatives |  | 15,181 |  |  | 141,688 |
Futures contracts |  | 77,889 |  |  | — |
Purchase commitments |  | 2,050 |  |  | 844 |
Credit derivatives (1) |  | 5,657 |  |  | 2,641 |
|  | $ | 113,556 |  |  | $ | 200,503 |
Liabilities |  |
Interest rate swaps |  | $ | 706,862 |  |  | $ | 420,365 |
TBA derivatives |  | 11,316 |  |  | — |
Futures contracts |  | 84,781 |  |  | 462,309 |
Purchase commitments |  | 907 |  |  | 33 |
Credit derivatives (1) |  | — |  |  | 7,043 |
|  | $ | 803,866 |  |  | $ | 889,750 |
(1) The notional amount of the credit derivatives in which the Company purchased protection was $10.0 million and $30.0 million at December 31, 2019 and December 31, 2018, respectively. The maximum potential amount of future payments is the notional amount of credit derivatives in which the Company sold protection of $345.0 million and $451.0 million at December 31, 2019 and December 31, 2018, respectively, plus any coupon shortfalls on the underlying tranche. The credit derivative tranches referencing the basket of bonds had a range of ratings between AA and BBB-.
Summary of Certain Characteristics of Derivatives | The following table summarizes certain characteristics of the Company’s interest rate swaps at December 31, 2019 and 2018:
December 31, 2019
Maturity | Current Notional (1)(2) |  | Weighted Average Pay Rate |  | Weighted Average Receive Rate |  | Weighted Average Years to Maturity
(dollars in thousands)
0 - 3 years | $ | 38,942,400 |  |  | 1.60 | % |  | 1.84 | % |  | 1.29
3 - 6 years | 16,097,450 |  |  | 1.77 | % |  | 1.87 | % |  | 4.30
6 - 10 years | 16,176,500 |  |  | 2.20 | % |  | 2.02 | % |  | 9.00
Greater than 10 years | 2,930,000 |  |  | 3.76 | % |  | 1.86 | % |  | 17.88
Total / Weighted average | $ | 74,146,350 |  |  | 1.84 | % |  | 1.89 | % |  | 4.23
December 31, 2018
Maturity | Current Notional (1)(2) |  | Weighted Average Pay Rate |  | Weighted Average Receive Rate |  | Weighted Average Years to Maturity
(dollars in thousands)
0 - 3 years | $ | 31,900,200 |  |  | 1.84 | % |  | 2.73 | % |  | 1.21
3 - 6 years | 16,603,200 |  |  | 2.29 | % |  | 2.70 | % |  | 4.30
6 - 10 years | 18,060,900 |  |  | 2.57 | % |  | 2.56 | % |  | 8.62
Greater than 10 years | 3,901,400 |  |  | 3.63 | % |  | 2.59 | % |  | 17.33
Total / Weighted average | $ | 70,465,700 |  |  | 2.17 | % |  | 2.68 | % |  | 4.26
(1) | As of December 31, 2019, 75% and 25% of the Company’s interest rate swaps were linked to LIBOR and the overnight index swap rate, respectively. As of December 31, 2018, all of the Company’s interest rate swaps were linked to LIBOR.
(2) | There were no forward starting swaps at December 31, 2019 and December 31, 2018.
The following table presents swaptions outstanding at December 31, 2019 and 2018.
December 31, 2019
|  | Current Underlying Notional |  | Weighted Average Underlying Fixed Rate |  | Weighted Average Underlying Floating Rate |  | Weighted Average Underlying Years to Maturity |  | Weighted Average Months to Expiration
(dollars in thousands)
Long pay |  | $4,675,000 |  | 2.53% |  | 3M LIBOR |  | 9.22 |  | 4.66
Long receive |  | $2,000,000 |  | 1.49% |  | 3M LIBOR |  | 10.29 |  | 3.40
December 31, 2018
|  | Current Underlying Notional |  | Weighted Average Underlying Fixed Rate |  | Weighted Average Underlying Floating Rate |  | Weighted Average Underlying Years to Maturity |  | Weighted Average Months to Expiration
(dollars in thousands)
Long pay |  | $4,075,000 |  | 3.30% |  | 3M LIBOR |  | 10.08 |  | 3.06
The following table summarizes certain characteristics of the Company’s TBA derivatives at December 31, 2019 and 2018:
December 31, 2019
Purchase and sale contracts for derivative TBAs | Notional |  | Implied Cost Basis |  | Implied Market Value |  | Net Carrying Value
(dollars in thousands)
Purchase contracts | $ | 10,043,000 |  |  | $ | 10,182,891 |  |  | $ | 10,192,038 |  |  | $ | 9,147 |
Sale contracts | (3,144,000 | ) |  | (3,294,486 | ) |  | (3,299,768 | ) |  | (5,282 | )
Net TBA derivatives | $ | 6,899,000 |  |  | $ | 6,888,405 |  |  | $ | 6,892,270 |  |  | $ | 3,865 |
December 31, 2018
Purchase and sale contracts for derivative TBAs | Notional |  | Implied Cost Basis |  | Implied Market Value |  | Net Carrying Value
(dollars in thousands)
Purchase contracts | $ | 13,803,000 |  |  | $ | 13,823,109 |  |  | $ | 13,964,797 |  |  | 141,688 |
The following table summarizes certain characteristics of the Company’s futures derivatives at December 31, 2019 and 2018:
December 31, 2019
| Notional - Long Positions |  | Notional - Short Positions |  | Weighted Average Years to Maturity
| (dollars in thousands) |  |  |  |
U.S. Treasury futures - 2 year | $ | — |  |  | $ | (180,000 | ) |  | 1.96
U.S. Treasury futures - 5 year | — |  |  | (2,953,300 | ) |  | 4.42
U.S. Treasury futures - 10 year and greater | 2,600,000 |  |  | (5,806,400 | ) |  | 9.74
Total | $ | 2,600,000 |  |  | $ | (8,939,700 | ) |  | 8.26
December 31, 2018
| Notional - Long Positions |  | Notional - Short Positions |  | Weighted Average Years to Maturity
| (dollars in thousands) |  |  |  |
U.S. Treasury futures - 2 year | $ | — |  |  | $ | (1,166,000 | ) |  | 1.97
U.S. Treasury futures - 5 year | — |  |  | (6,359,400 | ) |  | 4.39
U.S. Treasury futures - 10 year and greater | — |  |  | (11,152,600 | ) |  | 7.10
Total | $ | — |  |  | $ | (18,678,000 | ) |  | 5.86
Offsetting of Derivative Assets and Liabilities | The following tables present information about derivative assets and liabilities that are subject to such provisions and can be offset on our Consolidated Statements of Financial Condition at December 31, 2019 and 2018, respectively.
December 31, 2019
|  |  | Amounts Eligible for Offset |  |
| Gross Amounts |  | Financial Instruments |  | Cash Collateral |  | Net Amounts
Assets | (dollars in thousands)
Interest rate swaps, at fair value | $ | 1,199 |  |  | $ | (951 | ) |  | $ | — |  |  | $ | 248 |
Interest rate swaptions, at fair value | 11,580 |  |  | — |  |  | — |  |  | 11,580 |
TBA derivatives, at fair value | 15,181 |  |  | (5,018 | ) |  | — |  |  | 10,163 |
Futures contracts, at fair value | 77,889 |  |  | (10,902 | ) |  | — |  |  | 66,987 |
Purchase commitments | 2,050 |  |  | — |  |  | — |  |  | 2,050 |
Credit derivatives | 5,657 |  |  | — |  |  | — |  |  | 5,657 |
Liabilities |
Interest rate swaps, at fair value | $ | 706,862 |  |  | $ | (951 | ) |  | $ | (104,205 | ) |  | $ | 601,706 |
TBA derivatives, at fair value | 11,316 |  |  | (5,018 | ) |  | — |  |  | 6,298 |
Futures contracts, at fair value | 84,781 |  |  | (10,902 | ) |  | (73,879 | ) |  | — |
Purchase commitments | 907 |  |  | — |  |  | — |  |  | 907 |
December 31, 2018
|  |  | Amounts Eligible for Offset |  |
| Gross Amounts |  | Financial Instruments |  | Cash Collateral |  | Net Amounts
Assets | (dollars in thousands)
Interest rate swaps, at fair value | $ | 48,114 |  |  | $ | (29,308 | ) |  | $ | — |  |  | $ | 18,806 |
Interest rate swaptions, at fair value | 7,216 |  |  | — |  |  | — |  |  | 7,216 |
TBA derivatives, at fair value | 141,688 |  |  | — |  |  | — |  |  | 141,688 |
Purchase commitments | 844 |  |  | — |  |  | — |  |  | 844 |
Credit derivatives | 2,641 |  |  | (2,641 | ) |  | — |  |  | — |
Liabilities |
Interest rate swaps, at fair value | $ | 420,365 |  |  | $ | (29,308 | ) |  | $ | (11,856 | ) |  | $ | 379,201 |
Futures contracts, at fair value | 462,309 |  |  | — |  |  | (462,309 | ) |  | — |
Purchase commitments | 33 |  |  | — |  |  | — |  |  | 33 |
Credit derivatives | 7,043 |  |  | (2,641 | ) |  | (4,402 | ) |  | — |
Schedule of Derivative Instruments in Statement of Operations and Comprehensive Income Loss | The effect of interest rate swaps on the Consolidated Statements of Comprehensive Income (Loss) is as follows:
Location on Consolidated Statements of Comprehensive Income (Loss)
| Net Interest Component of Interest Rate Swaps |  | Realized Gains (Losses) on Termination of Interest Rate Swaps |  | Unrealized Gains (Losses) on Interest Rate Swaps
For the years ended | (dollars in thousands)
December 31, 2019 | $ | 351,375 |  |  | $ | (1,442,964 | ) |  | $ | (1,210,276 | )
December 31, 2018 | $ | 100,553 |  |  | $ | 1,409 |  |  | $ | 424,081 |
December 31, 2017 | $ | (371,108 | ) |  | $ | (160,133 | ) |  | $ | 512,918 |
Effect of Other Derivative Contracts on the Consolidated Statements of Operations and Comprehensive Income (Loss) | The effect of other derivative contracts on the Company’s Consolidated Statements of Comprehensive Income (Loss) is as follows:
Year Ended December 31, 2019
Derivative Instruments | Realized Gain (Loss) |  | Unrealized Gain (Loss) |  | Amount of Gain/(Loss) Recognized in Net Gains (Losses) on Other Derivatives
(dollars in thousands)
Net TBA derivatives | $ | 464,575 |  |  | $ | (137,823 | ) |  | $ | 326,752 |
Net interest rate swaptions | (47,863 | ) |  | (15,961 | ) |  | (63,824 | )
Futures | (1,418,143 | ) |  | 455,417 |  |  | (962,726 | )
Purchase commitments | — |  |  | 333 |  |  | 333 |
Credit derivatives | 8,077 |  |  | 10,618 |  |  | 18,695 |
Total |  |  |  |  | $ | (680,770 | )
Year Ended December 31, 2018
Derivative Instruments | Realized Gain (Loss) |  | Unrealized Gain (Loss) |  | Amount of Gain/(Loss) Recognized in Net Gains (Losses) on Other Derivatives
(dollars in thousands)
Net TBA derivatives | $ | (343,594 | ) |  | $ | 134,397 |  |  | $ | (209,197 | )
Net interest rate swaptions | (98,248 | ) |  | 2,679 |  |  | (95,569 | )
Futures | 564,418 |  |  | (668,384 | ) |  | (103,966 | )
Purchase commitments | — |  |  | 1,002 |  |  | 1,002 |
Credit derivatives | 9,662 |  |  | (5,945 | ) |  | 3,717 |
Total |  |  |  |  | $ | (404,013 | )

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