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Note 14 - Guarantor Subsidiaries - Unaudited Interim Condensed Consolidating Statements of Operations (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Revenues | $ 152,617 | $ 139,709
Cost of sales | (110,386) | (72,869)
Depreciation, depletion, amortization | (38,787) | (28,054)
General and administrative | (9,959) | (7,735)
Exploration and pre-development | (5,258) | (8,365)
Research and development | (403) | (1,436)
(Loss) gain on derivative contracts | (1,799) | 4,007
Acquisition costs | (13) | (2,507)
Equity in earnings of subsidiaries |  |
Other (expense) income | (18,761) | (13,742)
Income (loss) before income taxes | (32,749) | 9,008
(Provision) benefit from income taxes | 7,216 | (768)
Net (loss) income | (25,533) | 8,240
Series B Preferred Stock dividends declared ($0.875 per share) | (138) | (138)
(Loss) income applicable to common stockholders | (25,671) | 8,102
Changes in comprehensive (loss) income | 4,259 | (2,105)
Comprehensive (loss) income | (21,274) | 6,136
Revenues | 152,617 | 139,709
Gain on derivative contracts | (1,799) | 4,007
Other (expense) income | (18,761) | (13,742)
Reportable Legal Entities [Member] | Parent Company [Member] |  |
Revenues | (2,477) | 615
Cost of sales | (461) | 475
Depreciation, depletion, amortization |  |
General and administrative | (4,393) | (3,833)
Exploration and pre-development | (16) | (55)
Research and development |  |
(Loss) gain on derivative contracts | (1,799) | 4,007
Acquisition costs | 42 | (2,360)
Equity in earnings of subsidiaries | (22,433) | 17,768
Other (expense) income | 6,004 | (8,377)
Income (loss) before income taxes | (25,533) | 8,240
(Provision) benefit from income taxes |  |
Net (loss) income | (25,533) | 8,240
Series B Preferred Stock dividends declared ($0.875 per share) | (138) | (138)
(Loss) income applicable to common stockholders | (25,671) | 8,102
Changes in comprehensive (loss) income | 4,259 | (2,104)
Comprehensive (loss) income | (21,274) | 6,136
Revenues | (2,477) | 615
Gain on derivative contracts | (1,799) | 4,007
Other (expense) income | 6,004 | (8,377)
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member] |  |
Revenues | 102,432 | 70,211
Cost of sales | (66,869) | (34,701)
Depreciation, depletion, amortization | (20,872) | (11,260)
General and administrative | (5,111) | (3,448)
Exploration and pre-development | (1,544) | (1,939)
Research and development | (353) | (482)
(Loss) gain on derivative contracts |  |
Acquisition costs | (55) |
Equity in earnings of subsidiaries |  |
Other (expense) income | (5,730) | (6,794)
Income (loss) before income taxes | 1,898 | 11,587
(Provision) benefit from income taxes | (3,916) | (5,488)
Net (loss) income | (2,018) | 6,099
Series B Preferred Stock dividends declared ($0.875 per share) |  |
(Loss) income applicable to common stockholders | (2,018) | 6,099
Changes in comprehensive (loss) income |  |
Comprehensive (loss) income | (2,018) | 6,099
Revenues | 102,432 | 70,211
Gain on derivative contracts |  |
Other (expense) income | (5,730) | (6,794)
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member] |  |
Revenues | 52,662 | 68,883
Cost of sales | (43,056) | (38,643)
Depreciation, depletion, amortization | (17,915) | (16,794)
General and administrative | (455) | (454)
Exploration and pre-development | (3,698) | (6,371)
Research and development | (50) | (954)
(Loss) gain on derivative contracts |  |
Acquisition costs |  | (147)
Equity in earnings of subsidiaries |  |
Other (expense) income | (12,642) | 6,917
Income (loss) before income taxes | (25,154) | 12,437
(Provision) benefit from income taxes | 4,739 | (768)
Net (loss) income | (20,415) | 11,669
Series B Preferred Stock dividends declared ($0.875 per share) |  |
(Loss) income applicable to common stockholders | (20,415) | 11,669
Changes in comprehensive (loss) income |  | 38
Comprehensive (loss) income | (20,415) | 11,707
Revenues | 52,662 | 68,883
Gain on derivative contracts |  |
Other (expense) income | (12,642) | 6,917
Consolidation, Eliminations [Member] |  |
Revenues |  |
Cost of sales |  |
Depreciation, depletion, amortization |  |
General and administrative |  |
Exploration and pre-development |  |
Research and development |  |
(Loss) gain on derivative contracts |  |
Acquisition costs |  |
Equity in earnings of subsidiaries | 22,433 | (17,768)
Other (expense) income | (6,393) | (5,488)
Income (loss) before income taxes | 16,040 | (23,256)
(Provision) benefit from income taxes | 6,393 | 5,488
Net (loss) income | 22,433 | (17,768)
Series B Preferred Stock dividends declared ($0.875 per share) |  |
(Loss) income applicable to common stockholders | 22,433 | (17,768)
Changes in comprehensive (loss) income |  | (38)
Comprehensive (loss) income | 22,433 | (17,806)
Revenues |  |
Gain on derivative contracts |  |
Other (expense) income | $ (6,393) | $ (5,488)

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