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Stockholders' Equity (AOCI) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | $ 3,383,952 | $ 3,416,101 | $ 3,261,636
OCI before reclassifications | 367,840 | (3,007) | (136,097)
Amounts reclassified from AOCI | (660,594) | (47,234) | (52,839)
Other Comprehensive Loss | (292,754) | (50,241) | (188,936)
Ending balance | 2,524,802 | 3,383,952 | 3,416,101
Net Unrealized Gain/(Loss) on AFS Securities |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | 392,722 | 417,167 | 620,648
OCI before reclassifications | 420,281 | 20,335 | (150,642)
Amounts reclassified from AOCI | (733,396) | (44,780) | (52,839)
Other Comprehensive Loss | (313,115) | (24,445) | (203,481)
Ending balance | 79,607 | 392,722 | 417,167
Net Gain/(Loss) on Swaps |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | (22,675) | 3,121 | (11,424)
OCI before reclassifications | (50,127) | (23,342) | 14,545
Amounts reclassified from AOCI | 72,802 | (2,454) | 0
Other Comprehensive Loss | 22,675 | (25,796) | 14,545
Ending balance | 0 | (22,675) | 3,121
Net Unrealized Gain/(Loss) on Financing Agreements |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | 0 |  |
OCI before reclassifications | (2,314) |  |
Amounts reclassified from AOCI | 0 |  |
Other Comprehensive Loss | (2,314) |  |
Ending balance | (2,314) | 0 |
Accumulated Other Comprehensive Income |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | 370,047 | 420,288 | 609,224
Ending balance | $ 77,293 | $ 370,047 | $ 420,288

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