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Note 17 - Guarantor Subsidiaries - Unaudited Interim Condensed Consolidating Statements of Operations (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenues |  | $ 567,137 | $ 577,775 | $ 645,957
Cost of sales |  | (353,994) | (304,727) | (338,325)
Depreciation, depletion, and amortization | [1] | (134,044) | (120,599) | (123,631)
General and administrative |  | (36,542) | (35,611) | (45,040)
Exploration and pre-development |  |  | (28,958) |
Research and development |  | (5,441) | (3,276) | (243)
Gain (Loss) on Sale of Derivatives |  | 40,253 | (21,250) | 4,423
Acquisition costs |  | (10,045) | (25) | (2,695)
Equity in earnings of subsidiaries |  |  |  |
Other (expense) income |  | (60,006) | (70,886) | (33,173)
Income (loss) before income taxes |  | (33,264) | (7,557) | 89,659
Income tax (provision) benefit |  | 6,701 | (20,963) | (28,090)
Net (loss) income |  | (26,563) | (28,520) | 61,569
Series B Preferred Stock dividends declared |  | (552) | (552) | (552)
(Loss) income applicable to common stockholders |  | (27,115) | (29,072) | 61,017
Changes in comprehensive (loss) income |  | (17,807) | 11,229 | (1,971)
Comprehensive (loss) income |  | (44,370) | (17,291) | 59,598
Revenues |  | 567,137 | 577,775 | 645,957
Loss on derivative contracts |  | 40,253 | (21,250) | 4,423
Closed operations |  |  | (25) | (2,695)
Other (expense) income |  | (60,006) | (70,886) | (33,173)
Closed operations |  |  | (25) | (2,695)
Other (expense) income |  | (60,006) | (70,886) | (33,173)
Net income (loss) applicable to common shares |  | (27,115) | (29,072) | 61,017
Mineral, Exploration [Member] |  |  |  |
Exploration and pre-development |  | (40,582) |  | (17,857)
Reportable Legal Entities [Member] | Parent Company [Member] |  |  |  |
Revenues |  | 8,084 | (5,983) | (14,237)
Cost of sales |  | (446) | 1,098 |
Depreciation, depletion, and amortization |  |  |  |
General and administrative |  | (18,760) | (17,693) | (23,262)
Exploration and pre-development |  |  | (459) |
Research and development |  |  |  |
Gain (Loss) on Sale of Derivatives |  | 40,253 | (21,250) | 4,423
Acquisition costs |  | (9,445) |  |
Equity in earnings of subsidiaries |  | (47,229) | (187,574) | 86,900
Other (expense) income |  | 515 | 203,365 | 10,656
Income (loss) before income taxes |  | (27,158) | (28,520) | 61,569
Income tax (provision) benefit |  | 595 |  |
Net (loss) income |  | (26,563) | (28,520) | 61,569
Series B Preferred Stock dividends declared |  | (552) | (552) | (552)
(Loss) income applicable to common stockholders |  | (27,115) | (29,072) | 61,017
Changes in comprehensive (loss) income |  | (17,807) | 11,229 | (1,971)
Comprehensive (loss) income |  | (44,370) | (17,291) | 59,598
Revenues |  | 8,084 | (5,983) | (14,237)
Loss on derivative contracts |  | 40,253 | (21,250) | 4,423
Closed operations |  |  | (24) | (2,607)
Other (expense) income |  | 515 | 203,365 | 10,656
Closed operations |  |  | (24) | (2,607)
Other (expense) income |  | 515 | 203,365 | 10,656
Net income (loss) applicable to common shares |  | (27,115) | (29,072) | 61,017
Reportable Legal Entities [Member] | Parent Company [Member] | Mineral, Exploration [Member] |  |  |  |
Exploration and pre-development |  | (130) |  | (304)
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member] |  |  |  |
Revenues |  | 298,491 | 305,835 | 369,162
Cost of sales |  | (188,567) | (158,135) | (202,475)
Depreciation, depletion, and amortization |  | (58,140) | (58,774) | (65,032)
General and administrative |  | (15,761) | (15,690) | (20,425)
Exploration and pre-development |  |  | (11,600) |
Research and development |  | (2,893) | (3,276) |
Gain (Loss) on Sale of Derivatives |  |  |  |
Acquisition costs |  | (344) |  |
Equity in earnings of subsidiaries |  |  |  |
Other (expense) income |  | (29,302) | (29,735) | 11,400
Income (loss) before income taxes |  | (17,030) | 28,625 | 85,956
Income tax (provision) benefit |  | (37,444) | (208,793) | (25,334)
Net (loss) income |  | (54,474) | (180,168) | 60,622
Series B Preferred Stock dividends declared |  |  |  |
(Loss) income applicable to common stockholders |  | (54,474) | (180,168) | 60,622
Changes in comprehensive (loss) income |  |  | 296 | 8
Comprehensive (loss) income |  | (54,474) | (179,872) | 60,630
Revenues |  | 298,491 | 305,835 | 369,162
Loss on derivative contracts |  |  |  |
Closed operations |  |  |  | (34)
Other (expense) income |  | (29,302) | (29,735) | 11,400
Closed operations |  |  |  | (34)
Other (expense) income |  | (29,302) | (29,735) | 11,400
Net income (loss) applicable to common shares |  | (54,474) | (180,168) | 60,622
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member] | Mineral, Exploration [Member] |  |  |  |
Exploration and pre-development |  | (20,514) |  | (6,640)
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member] |  |  |  |
Revenues |  | 260,562 | 277,923 | 291,032
Cost of sales |  | (164,981) | (147,690) | (135,850)
Depreciation, depletion, and amortization |  | (75,904) | (61,825) | (58,599)
General and administrative |  | (2,021) | (2,228) | (1,353)
Exploration and pre-development |  |  | (16,899) |
Research and development |  | (2,548) |  |
Gain (Loss) on Sale of Derivatives |  |  |  |
Acquisition costs |  | (256) |  |
Equity in earnings of subsidiaries |  |  |  |
Other (expense) income |  | 16,212 | (42,002) | (35,885)
Income (loss) before income taxes |  | 11,126 | 7,278 | 48,378
Income tax (provision) benefit |  | (3,881) | (14,684) | (22,100)
Net (loss) income |  | 7,245 | (7,406) | 26,278
Series B Preferred Stock dividends declared |  |  |  |
(Loss) income applicable to common stockholders |  | 7,245 | (7,406) | 26,278
Changes in comprehensive (loss) income |  | 38 | 2,486 | 2,657
Comprehensive (loss) income |  | 7,283 | (4,920) | 28,935
Revenues |  | 260,562 | 277,923 | 291,032
Loss on derivative contracts |  |  |  |
Closed operations |  |  | (1) | (54)
Other (expense) income |  | 16,212 | (42,002) | (35,885)
Closed operations |  |  | (1) | (54)
Other (expense) income |  | 16,212 | (42,002) | (35,885)
Net income (loss) applicable to common shares |  | 7,245 | (7,406) | 26,278
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member] | Mineral, Exploration [Member] |  |  |  |
Exploration and pre-development |  | (19,938) |  | (10,913)
Consolidation, Eliminations [Member] |  |  |  |
Revenues |  |  |  |
Cost of sales |  |  |  |
Depreciation, depletion, and amortization |  |  |  |
General and administrative |  |  |  |
Exploration and pre-development |  |  |  |
Research and development |  |  |  |
Gain (Loss) on Sale of Derivatives |  |  |  |
Acquisition costs |  |  |  |
Equity in earnings of subsidiaries |  | 47,229 | 187,574 | (86,900)
Other (expense) income |  | (47,431) | (202,514) | (19,344)
Income (loss) before income taxes |  | (202) | (14,940) | (106,244)
Income tax (provision) benefit |  | 47,431 | 202,514 | 19,344
Net (loss) income |  | 47,229 | 187,574 | (86,900)
Series B Preferred Stock dividends declared |  |  |  |
(Loss) income applicable to common stockholders |  | 47,229 | 187,574 | (86,900)
Changes in comprehensive (loss) income |  | (38) | (2,782) | (2,665)
Comprehensive (loss) income |  | 47,191 | 184,792 | (89,565)
Revenues |  |  |  |
Loss on derivative contracts |  |  |  |
Closed operations |  |  |  |
Other (expense) income |  | (47,431) | (202,514) | (19,344)
Closed operations |  |  |  |
Other (expense) income |  | (47,431) | (202,514) | (19,344)
Net income (loss) applicable to common shares |  | 47,229 | $ 187,574 | (86,900)
Consolidation, Eliminations [Member] | Mineral, Exploration [Member] |  |  |  |
Exploration and pre-development |  |  |  |
[1] | Amounts reported as of and for the years ended December 31, 2017 and 2016 have been revised. See Note 2 for more information.

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- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 + Details
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