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Special Charges and Unrealized (Gains) Losses on Investments - Components of Special Charges (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Operating: |  |  |  |  |  |  |  |  |  |  |
CARES Act grant | $ (453,000) | $ (1,494,000) | $ (1,589,000) | $ 0 |  |  |  |  | $ (3,536,000) | $ 0 | $ 0
Severance and benefit costs | 162,000 | 350,000 | 63,000 | 0 | $ 2,000 | $ 2,000 | $ 6,000 | $ 6,000 | 575,000 | 16,000 | 41,000
Impairment of assets | 137,000 | 51,000 | 80,000 | 50,000 | 102,000 | 0 | 61,000 | 8,000 | 318,000 | 171,000 | 377,000
Termination of an engine maintenance service agreement |  |  |  |  |  |  |  |  | 0 | 0 | 64,000
(Gains) losses on sale of assets and other special charges | 5,000 | 12,000 | (3,000) | 13,000 | 26,000 | 25,000 | 4,000 | 4,000 | 27,000 | 59,000 | 5,000
Total operating special charges (credit) | (149,000) | (1,081,000) | (1,449,000) | 63,000 | 130,000 | 27,000 | 71,000 | 18,000 | (2,616,000) | 246,000 | 487,000
Nonoperating credit loss on BRW Term Loan and related guarantee | 0 | 0 | 0 | 697,000 |  |  |  |  | 697,000 | 0 | 0
Nonoperating special termination benefits and settlement losses | 41,000 | 415,000 | 231,000 | 0 |  |  |  |  | 687,000 | 0 | 0
Nonoperating unrealized (gains) losses on investments | (101,000) | (15,000) | (9,000) | 319,000 | (81,000) | (21,000) | (34,000) | (17,000) | 194,000 | (153,000) | 5,000
Total special charges and unrealized (gains) losses on investments | (60,000) | 400,000 | 222,000 | 1,016,000 | 49,000 | 6,000 | 37,000 | 1,000 | 1,578,000 | (153,000) | 5,000
Total operating and nonoperating special charges (credit) and unrealized (gains) losses on investments | (209,000) | (681,000) | (1,227,000) | 1,079,000 |  |  |  |  | (1,038,000) | 93,000 | 492,000
Income tax expense (benefit), net of valuation allowance | 29,000 | 148,000 | 241,000 | (14,000) | (11,000) | (2,000) | (8,000) | 0 | 404,000 | (21,000) | (110,000)
Income tax adjustments |  |  |  |  |  |  |  |  | 0 | 0 | (5,000)
Total operating and nonoperating special charges (credit) and unrealized (gains) losses on investments, net of income taxes | $ (180,000) | $ (533,000) | $ (986,000) | $ 1,065,000 | $ 38,000 | $ 4,000 | $ 29,000 | $ 1,000 | $ (634,000) | $ 72,000 | $ 377,000

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