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Stockholders' Equity (Accumulated Other Comprehensive Income/(Loss)) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Components of accumulated other comprehensive income/(loss) |  |  |  |
Balance | $ 2,526,537 | $ 2,521,051 | $ 2,524,802 | $ 3,383,952
OCI before reclassifications | (7,820) | (7,570) | (20,538) | 335,806
Amounts reclassified from AOCI | 0 | 7,116 | 0 | (660,594)
Other Comprehensive (Loss) | (7,820) | (454) | (20,538) | (324,788)
Balance | 2,601,087 | 2,565,656 | 2,601,087 | 2,565,656
Total AOCI |  |  |  |
Components of accumulated other comprehensive income/(loss) |  |  |  |
Balance | 64,575 | 45,713 | 77,293 | 370,047
Balance | 56,755 | 45,259 | 56,755 | 45,259
Net Unrealized Gain/(Loss) on AFS Securities |  |  |  |
Components of accumulated other comprehensive income/(loss) |  |  |  |
Balance | 66,163 | 52,889 | 79,607 | 392,722
OCI before reclassifications | (8,029) | 15,082 | (21,473) | 408,585
Amounts reclassified from AOCI | 0 | (60) | 0 | (733,396)
Other Comprehensive (Loss) | (8,029) | 15,022 | (21,473) | (324,811)
Balance | 58,134 | 67,911 | 58,134 | 67,911
Net (Loss)/Gain on Swaps |  |  |  |
Components of accumulated other comprehensive income/(loss) |  |  |  |
Balance | 0 | (7,176) | 0 | (22,675)
OCI before reclassifications | 0 | 0 | 0 | (50,127)
Amounts reclassified from AOCI | 0 | 7,176 | 0 | 72,802
Other Comprehensive (Loss) | 0 | 7,176 | 0 | 22,675
Balance | 0 | 0 | 0 | 0
Net Unrealized Gain/(Loss) on Financing Agreements |  |  |  |
Components of accumulated other comprehensive income/(loss) |  |  |  |
Balance | (1,588) | 0 | (2,314) | 0
OCI before reclassifications | 209 | (22,652) | 935 | (22,652)
Amounts reclassified from AOCI | 0 | 0 | 0 | 0
Other Comprehensive (Loss) | 209 | (22,652) | 935 | (22,652)
Balance | $ (1,379) | $ (22,652) | $ (1,379) | $ (22,652)

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- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=124431353&loc=SL124442411-227067 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32136-110900 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669686-108580 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=124507222&loc=d3e1436-108581 Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=124431353&loc=SL124442407-227067 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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