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Accumulated Other Comprehensive Income (Changes in AOCI) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Beginning Balance | $ 1,798,263 | $ 1,679,911
Ending Balance | 1,947,320 | 1,798,263
Derivative Instruments |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Beginning Balance | (7,013) | 3,574
Other Comprehensive Loss Before Reclassifications | (17,422) | (9,603)
Amounts Reclassified from Accumulated Other Comprehensive Income | 7,127 | (984)
Net Current Period Other Comprehensive Loss | (10,295) | (10,587)
Ending Balance | (17,308) | (7,013)
Comprehensive Income (Loss) Attributable to Noncontrolling Interest of the Company |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Beginning Balance | 130 | (72)
Other Comprehensive Loss Before Reclassifications | 225 | 202
Amounts Reclassified from Accumulated Other Comprehensive Income | 0 | 0
Net Current Period Other Comprehensive Loss | 225 | 202
Ending Balance | 355 | 130
Accumulated Other Comprehensive Income (Loss) of the Company |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Beginning Balance | (6,883) | 3,502
Other Comprehensive Loss Before Reclassifications | (17,197) | (9,401)
Amounts Reclassified from Accumulated Other Comprehensive Income | 7,127 | (984)
Net Current Period Other Comprehensive Loss | (10,070) | (10,385)
Ending Balance | (16,953) | (6,883)
First Industrial, L.P. | Accumulated Other Comprehensive Income of the Operating Partnership |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Beginning Balance | (7,013) | 3,574
Other Comprehensive Loss Before Reclassifications | (17,422) | (9,603)
Amounts Reclassified from Accumulated Other Comprehensive Income | 7,127 | (984)
Net Current Period Other Comprehensive Loss | (10,295) | (10,587)
Ending Balance | $ (17,308) | $ (7,013)

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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 830 -SubTopic 30 -Section 45 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32136-110900 Reference 2: 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 3: 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=121641772&loc=SL7669686-108580 Reference 4: 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=121640130&loc=d3e1436-108581 Reference 5: 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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