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Note 13 - Guarantor Subsidiaries - Unaudited Interim Condensed Consolidating Statements of Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Revenues | $ 199,703 | $ 161,532 | $ 502,983 | $ 448,321
Cost of sales | (105,977) | (95,878) | (284,717) | (311,202)
Depreciation, depletion, amortization | (40,238) | (50,774) | (119,327) | (139,038)
General and administrative | (11,713) | (7,978) | (27,631) | (26,855)
Exploration and pre-development | (4,166) | (5,689) | (9,756) | (16,091)
Loss on derivative contracts | (6,666) | (4,718) | (12,775) | (2,719)
Acquisition costs | (2) | (183) | (13) | (593)
Equity in earnings of subsidiaries | 0 | 0 | 0 | 0
Other (expense) income | (15,680) | (17,389) | (65,152) | (62,799)
Income (loss) before income taxes | 15,261 | (21,130) | (16,388) | (111,590)
(Provision) benefit from income taxes | (1,633) | 1,614 | (1,197) | 20,009
Net income (loss) | 13,628 | (19,516) | (17,585) | (91,581)
Series B Preferred Stock dividends declared | (138) | (138) | (414) | (414)
Income (loss) applicable to common shareholders | 13,490 | (19,654) | (17,999) | (91,995)
Changes in comprehensive income (loss) | 6,150 | (3,288) | (2,801) | 4,511
Comprehensive income (loss) | 19,778 | (22,804) | (20,386) | (87,070)
Research and development | 0 | (53) | 0 | (614)
Reportable Legal Entities [Member] | Parent Company [Member] |  |  |  |
Revenues | (9,558) | 1,049 | (12,877) | (136)
Cost of sales | (1,268) | (472) | (2,596) | (1,190)
Depreciation, depletion, amortization | 0 | 0 | 0 | 0
General and administrative | (4,716) | (2,951) | (9,520) | (12,110)
Exploration and pre-development | (2) | (3) | (25) | (22)
Loss on derivative contracts | (6,666) | (4,718) | (12,775) | (2,719)
Acquisition costs | (2) | (100) | (13) | (221)
Equity in earnings of subsidiaries | 21,895 | (6,761) | 28,624 | (77,563)
Other (expense) income | 14,066 | (5,560) | (8,245) | 2,382
Income (loss) before income taxes | 13,749 | (19,516) | (17,427) | (91,579)
(Provision) benefit from income taxes | (121) | 0 | (158) | (2)
Net income (loss) | 13,628 | (19,516) | (17,585) | (91,581)
Series B Preferred Stock dividends declared | (138) | (138) | (414) | (414)
Income (loss) applicable to common shareholders | 13,490 | (19,654) | (17,999) | (91,995)
Changes in comprehensive income (loss) | 6,150 | (3,288) | (2,801) | 4,511
Comprehensive income (loss) | 19,778 | (22,804) | (20,386) | (87,070)
Research and development |  | 0 |  | 0
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member] |  |  |  |
Revenues | 200,124 | 144,999 | 491,860 | 409,339
Cost of sales | (99,530) | (85,829) | (266,986) | (280,397)
Depreciation, depletion, amortization | (39,457) | (47,448) | (116,178) | (132,104)
General and administrative | (6,688) | (4,722) | (16,816) | (13,571)
Exploration and pre-development | (2,977) | (4,315) | (6,777) | (10,645)
Loss on derivative contracts | 0 | 0 | 0 | 0
Acquisition costs | 0 | (83) | 0 | (219)
Equity in earnings of subsidiaries | 0 | 0 | 0 | 0
Other (expense) income | (19,594) | (8,523) | (40,191) | (54,975)
Income (loss) before income taxes | 31,878 | (5,884) | 44,912 | (83,093)
(Provision) benefit from income taxes | (13,211) | (625) | (19,812) | 6,864
Net income (loss) | 18,667 | (6,509) | 25,100 | (76,229)
Series B Preferred Stock dividends declared | 0 | 0 | 0 | 0
Income (loss) applicable to common shareholders | 18,667 | (6,509) | 25,100 | (76,229)
Changes in comprehensive income (loss) | 0 | 0 | 0 | 0
Comprehensive income (loss) | 18,667 | (6,509) | 25,100 | (76,229)
Research and development |  | 37 |  | (521)
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member] |  |  |  |
Revenues | 9,137 | 15,484 | 24,000 | 39,118
Cost of sales | (5,179) | (9,577) | (15,135) | (29,615)
Depreciation, depletion, amortization | (781) | (3,326) | (3,149) | (6,934)
General and administrative | (309) | (305) | (1,295) | (1,174)
Exploration and pre-development | (1,187) | (1,371) | (2,954) | (5,424)
Loss on derivative contracts | 0 | 0 | 0 | 0
Acquisition costs | 0 | 0 | 0 | (153)
Equity in earnings of subsidiaries | 0 | 0 | 0 | 0
Other (expense) income | 2,298 | 451 | 3,882 | 2,383
Income (loss) before income taxes | 3,979 | 1,266 | 5,349 | (1,892)
(Provision) benefit from income taxes | (751) | (1,518) | (1,825) | 558
Net income (loss) | 3,228 | (252) | 3,524 | (1,334)
Series B Preferred Stock dividends declared | 0 | 0 | 0 | 0
Income (loss) applicable to common shareholders | 3,228 | (252) | 3,524 | (1,334)
Changes in comprehensive income (loss) | 0 | 0 | 0 | 0
Comprehensive income (loss) | 3,228 | (252) | 3,524 | (1,334)
Research and development |  | (90) |  | (93)
Consolidation, Eliminations [Member] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Cost of sales | 0 | 0 | 0 | 0
Depreciation, depletion, amortization | 0 | 0 | 0 | 0
General and administrative | 0 | 0 | 0 | 0
Exploration and pre-development | 0 | 0 | 0 | 0
Loss on derivative contracts | 0 | 0 | 0 | 0
Acquisition costs | 0 | 0 | 0 | 0
Equity in earnings of subsidiaries | (21,895) | 6,761 | (28,624) | 77,563
Other (expense) income | (12,450) | (3,757) | (20,598) | (12,589)
Income (loss) before income taxes | (34,345) | 3,004 | (49,222) | 64,974
(Provision) benefit from income taxes | 12,450 | 3,757 | 20,598 | 12,589
Net income (loss) | (21,895) | 6,761 | (28,624) | 77,563
Series B Preferred Stock dividends declared | 0 | 0 | 0 | 0
Income (loss) applicable to common shareholders | (21,895) | 6,761 | (28,624) | 77,563
Changes in comprehensive income (loss) | 0 | 0 | 0 | 0
Comprehensive income (loss) | $ (21,895) | 6,761 | $ (28,624) | 77,563
Research and development |  | $ 0 |  | $ 0

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