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GUARANTORS OF SECURITIES Supplemental Condensed Consolidating Statements of Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 60,377 | $ 58,909 | $ 55,480 | $ 51,293 | $ 52,016 | $ 54,610 | $ 57,728 | $ 57,322 | $ 226,059 | $ 221,676 | $ 231,321
Costs and expenses |  |  |  |  |  |  |  |  |  |  |
Operating |  |  |  |  |  |  |  |  | 154,546 | 151,523 | 167,446
Administrative and general |  |  |  |  |  |  |  |  | 38,278 | 45,126 | 42,092
Depreciation |  |  |  |  |  |  |  |  | 37,619 | 39,541 | 45,736
Total costs and expenses |  |  |  |  |  |  |  |  | 230,443 | 236,190 | 255,274
Gains on asset dispositions, net |  |  |  |  |  |  |  |  | 3,657 | 1,575 | 4,507
Litigation settlement proceeds |  |  |  |  |  |  |  |  | 0 | 42,000 | 0
Loss on impairment |  |  |  |  |  |  |  |  | 2,551 | 991 | 117,018
Operating income (loss) | 710 | 1,687 | (1,823) | (3,852) | (5,629) | 41,571 | (9,523) | 1,651 | (3,278) | 28,070 | (136,464)
Other income (expense) |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  | 3,487 | 2,042 | 760
Interest expense |  |  |  |  |  |  |  |  | (13,874) | (15,131) | (16,763)
Loss on sale of investments |  |  |  |  |  |  |  |  | (569) | 0 | 0
Foreign currency gains (losses), net |  |  |  |  |  |  |  |  | (472) | (1,018) | (226)
Gain on debt extinguishment |  |  |  |  |  |  |  |  | (13) | 175 | 0
Other, net |  |  |  |  |  |  |  |  | (28) | 54 | (12)
Total other income (expense) |  |  |  |  |  |  |  |  | (11,469) | (13,878) | (16,241)
Income (loss) before income tax expense and equity earnings |  |  |  |  |  |  |  |  | (14,747) | 14,192 | (152,705)
Income tax expense (benefit) |  |  |  |  |  |  |  |  | (731) | 2,940 | (122,665)
Income (loss) before equity earnings |  |  |  |  |  |  |  |  | (14,016) | 11,252 | (30,040)
Equity earnings, net of tax |  |  |  |  |  |  |  |  | 9,935 | 2,206 | 1,425
Equity in earnings (losses) of subsidiaries |  |  |  |  |  |  |  |  | 9,935 | 2,206 | 0
Net income (loss) | $ (811) | $ (2,059) | $ 4,874 | $ (6,085) | $ (5,948) | $ 31,279 | $ (10,516) | $ (1,357) | (4,081) | 13,458 | (28,615)
Net loss attributable to noncontrolling interest in subsidiaries |  |  |  |  |  |  |  |  | 488 | 464 | 454
Net income (loss) attributable to Era Group Inc. |  |  |  |  |  |  |  |  | (3,593) | 13,922 | (28,161)
Parent |  |  |  |  |  |  |  |  |  |  |
Costs and expenses |  |  |  |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  |  |  |  |  |  | 0 |
Guarantors |  |  |  |  |  |  |  |  |  |  |
Costs and expenses |  |  |  |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  |  |  |  |  |  | 991 |
Non-guarantors |  |  |  |  |  |  |  |  |  |  |
Costs and expenses |  |  |  |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  |  |  |  |  |  | 0 |
Reportable Legal Entities | Parent |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
Costs and expenses |  |  |  |  |  |  |  |  |  |  |
Operating |  |  |  |  |  |  |  |  | 0 | 0 | 0
Administrative and general |  |  |  |  |  |  |  |  | 5,777 | 15,017 | 7,887
Depreciation |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total costs and expenses |  |  |  |  |  |  |  |  | 5,777 | 15,017 | 7,887
Gains on asset dispositions, net |  |  |  |  |  |  |  |  | 0 | 0 | 0
Litigation settlement proceeds |  |  |  |  |  |  |  |  |  | 42,000 |
Loss on impairment |  |  |  |  |  |  |  |  | 0 |  | 0
Operating income (loss) |  |  |  |  |  |  |  |  | (5,777) | 26,983 | (7,887)
Other income (expense) |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  | 1,617 | 395 | 108
Interest expense |  |  |  |  |  |  |  |  | (13,007) | (14,149) | (14,495)
Loss on sale of investments |  |  |  |  |  |  |  |  | (569) |  |
Foreign currency gains (losses), net |  |  |  |  |  |  |  |  | (40) | (95) | 256
Gain on debt extinguishment |  |  |  |  |  |  |  |  | (13) | 0 |
Other, net |  |  |  |  |  |  |  |  | (20) | 0 | 0
Total other income (expense) |  |  |  |  |  |  |  |  | (12,032) | (13,849) | (14,131)
Income (loss) before income tax expense and equity earnings |  |  |  |  |  |  |  |  | (17,809) | 13,134 | (22,018)
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 2,964 | 10,845 | (7,338)
Income (loss) before equity earnings |  |  |  |  |  |  |  |  | (20,773) | 2,289 | (14,680)
Equity earnings, net of tax |  |  |  |  |  |  |  |  |  |  | 0
Equity in earnings (losses) of subsidiaries |  |  |  |  |  |  |  |  | 17,191 | 11,601 | (13,481)
Net income (loss) |  |  |  |  |  |  |  |  | (3,582) | 13,890 | (28,161)
Net loss attributable to noncontrolling interest in subsidiaries |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income (loss) attributable to Era Group Inc. |  |  |  |  |  |  |  |  | (3,582) | 13,890 | (28,161)
Reportable Legal Entities | Guarantors |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 202,653 | 194,932 | 201,653
Costs and expenses |  |  |  |  |  |  |  |  |  |  |
Operating |  |  |  |  |  |  |  |  | 128,928 | 122,490 | 133,077
Administrative and general |  |  |  |  |  |  |  |  | 28,930 | 25,597 | 28,451
Depreciation |  |  |  |  |  |  |  |  | 36,716 | 38,553 | 44,756
Total costs and expenses |  |  |  |  |  |  |  |  | 194,574 | 186,640 | 206,284
Gains on asset dispositions, net |  |  |  |  |  |  |  |  | 3,657 | 1,618 | 4,364
Litigation settlement proceeds |  |  |  |  |  |  |  |  |  | 0 |
Loss on impairment |  |  |  |  |  |  |  |  | 2,551 |  | 116,586
Operating income (loss) |  |  |  |  |  |  |  |  | 9,185 | 8,919 | (116,853)
Other income (expense) |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  | 1,761 | 1,371 | 419
Interest expense |  |  |  |  |  |  |  |  | (790) | (802) | (800)
Loss on sale of investments |  |  |  |  |  |  |  |  | 0 |  |
Foreign currency gains (losses), net |  |  |  |  |  |  |  |  | 81 | (178) | 330
Gain on debt extinguishment |  |  |  |  |  |  |  |  | 0 | 0 |
Other, net |  |  |  |  |  |  |  |  | 1,010 | 34 | 143
Total other income (expense) |  |  |  |  |  |  |  |  | 2,062 | 425 | 92
Income (loss) before income tax expense and equity earnings |  |  |  |  |  |  |  |  | 11,247 | 9,344 | (116,761)
Income tax expense (benefit) |  |  |  |  |  |  |  |  | (3,357) | (7,900) | (112,295)
Income (loss) before equity earnings |  |  |  |  |  |  |  |  | 14,604 | 17,244 | (4,466)
Equity earnings, net of tax |  |  |  |  |  |  |  |  |  |  | 1,425
Equity in earnings (losses) of subsidiaries |  |  |  |  |  |  |  |  | 9,935 | 2,206 | 0
Net income (loss) |  |  |  |  |  |  |  |  | 24,539 | 19,450 | (3,041)
Net loss attributable to noncontrolling interest in subsidiaries |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income (loss) attributable to Era Group Inc. |  |  |  |  |  |  |  |  | 24,539 | 19,450 | (3,041)
Reportable Legal Entities | Non-guarantors |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 55,695 | 55,625 | 60,466
Costs and expenses |  |  |  |  |  |  |  |  |  |  |
Operating |  |  |  |  |  |  |  |  | 57,896 | 57,947 | 65,167
Administrative and general |  |  |  |  |  |  |  |  | 3,571 | 4,512 | 5,754
Depreciation |  |  |  |  |  |  |  |  | 903 | 988 | 980
Total costs and expenses |  |  |  |  |  |  |  |  | 62,370 | 63,447 | 71,901
Gains on asset dispositions, net |  |  |  |  |  |  |  |  | 0 | (43) | 143
Litigation settlement proceeds |  |  |  |  |  |  |  |  |  | 0 |
Loss on impairment |  |  |  |  |  |  |  |  | 0 |  | 432
Operating income (loss) |  |  |  |  |  |  |  |  | (6,675) | (7,865) | (11,724)
Other income (expense) |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  | 109 | 276 | 233
Interest expense |  |  |  |  |  |  |  |  | (77) | (180) | (1,468)
Loss on sale of investments |  |  |  |  |  |  |  |  | 0 |  |
Foreign currency gains (losses), net |  |  |  |  |  |  |  |  | (513) | (745) | (812)
Gain on debt extinguishment |  |  |  |  |  |  |  |  | 0 | 175 |
Other, net |  |  |  |  |  |  |  |  | (1,018) | 20 | (155)
Total other income (expense) |  |  |  |  |  |  |  |  | (1,499) | (454) | (2,202)
Income (loss) before income tax expense and equity earnings |  |  |  |  |  |  |  |  | (8,174) | (8,319) | (13,926)
Income tax expense (benefit) |  |  |  |  |  |  |  |  | (338) | (5) | (3,032)
Income (loss) before equity earnings |  |  |  |  |  |  |  |  | (7,836) | (8,314) | (10,894)
Equity earnings, net of tax |  |  |  |  |  |  |  |  |  |  | 0
Equity in earnings (losses) of subsidiaries |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income (loss) |  |  |  |  |  |  |  |  | (7,836) | (8,314) | (10,894)
Net loss attributable to noncontrolling interest in subsidiaries |  |  |  |  |  |  |  |  | 488 | 464 | 454
Net income (loss) attributable to Era Group Inc. |  |  |  |  |  |  |  |  | (7,348) | (7,850) | (10,440)
Eliminations |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | (32,289) | (28,881) | (30,798)
Costs and expenses |  |  |  |  |  |  |  |  |  |  |
Operating |  |  |  |  |  |  |  |  | (32,278) | (28,914) | (30,798)
Administrative and general |  |  |  |  |  |  |  |  | 0 | 0 | 0
Depreciation |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total costs and expenses |  |  |  |  |  |  |  |  | (32,278) | (28,914) | (30,798)
Gains on asset dispositions, net |  |  |  |  |  |  |  |  | 0 | 0 | 0
Litigation settlement proceeds |  |  |  |  |  |  |  |  |  | 0 |
Loss on impairment |  |  |  |  |  |  |  |  | 0 | 0 | 0
Operating income (loss) |  |  |  |  |  |  |  |  | (11) | 33 | 0
Other income (expense) |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest expense |  |  |  |  |  |  |  |  | 0 | 0 | 0
Loss on sale of investments |  |  |  |  |  |  |  |  | 0 |  |
Foreign currency gains (losses), net |  |  |  |  |  |  |  |  | 0 | 0 | 0
Gain on debt extinguishment |  |  |  |  |  |  |  |  | 0 | 0 |
Other, net |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total other income (expense) |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income (loss) before income tax expense and equity earnings |  |  |  |  |  |  |  |  | (11) | 33 | 0
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income (loss) before equity earnings |  |  |  |  |  |  |  |  | (11) | 33 | 0
Equity earnings, net of tax |  |  |  |  |  |  |  |  |  |  | 0
Equity in earnings (losses) of subsidiaries |  |  |  |  |  |  |  |  | (17,191) | (11,601) | 13,481
Net income (loss) |  |  |  |  |  |  |  |  | (17,202) | (11,568) | 13,481
Net loss attributable to noncontrolling interest in subsidiaries |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income (loss) attributable to Era Group Inc. |  |  |  |  |  |  |  |  | $ (17,202) | $ (11,568) | $ 13,481

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