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Note 16 - Guarantor Subsidiaries - Unaudited Interim Condensed Consolidating Statements of Operations (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenues | $ (577,775) | $ (645,957) | $ (443,567)
Revenues | 577,775 | 645,957 | 443,567
Cost of sales | (304,727) | (338,325) | (292,378)
Depreciation, depletion, and amortization | (116,062) | (116,126) | (112,678)
General and administrative | (35,611) | (45,040) | (34,201)
Exploration and pre-development | (28,958) | (17,857) | (21,958)
Research and development | (3,276) | (243) |
Gain (loss) on derivative contracts | (21,250) | 4,423 | 8,252
Acquisition costs | (25) | (2,695) | (2,162)
Equity in earnings of subsidiaries |  |  |
Other (expense) income | (71,506) | (33,362) | (19,100)
Income (loss) before income taxes | (3,640) | 96,975 | (30,658)
(Provision) benefit from income taxes | (19,879) | (27,428) | (56,310)
Net (loss) income | (23,519) | 69,547 | (86,968)
Series B Preferred Stock dividends declared | (552) | (552) | (552)
(Loss) income applicable to common stockholders | (24,071) | 68,995 | (87,520)
Changes in comprehensive (loss) income | 11,229 | (1,971) | (600)
Comprehensive (loss) income | (12,290) | 67,576 | (87,568)
Closed operations |  | (2,695) | (2,162)
Other (expense) income | (71,506) | (33,362) | (19,100)
Reportable Legal Entities [Member] | Parent Company [Member] |  |  |
Revenues | (5,983) | (14,237) | 6,194
Revenues | 5,983 | 14,237 | (6,194)
Cost of sales | 1,098 |  |
Depreciation, depletion, and amortization |  |  |
General and administrative | (17,693) | (23,262) | (17,920)
Exploration and pre-development | (459) | (304) | (627)
Research and development |  |  |
Gain (loss) on derivative contracts | (21,250) | 4,423 | 8,252
Acquisition costs | (24) |  |
Equity in earnings of subsidiaries | (182,573) | 94,878 | 49,565
Other (expense) income | 203,365 | 10,656 | (131,915)
Income (loss) before income taxes | (23,519) | 69,547 | (86,968)
(Provision) benefit from income taxes |  |  |
Net (loss) income | (23,519) | 69,547 | (86,968)
Series B Preferred Stock dividends declared | (552) | (552) | (552)
(Loss) income applicable to common stockholders | (24,071) | 68,995 | (87,520)
Changes in comprehensive (loss) income | 11,229 | (1,971) | (600)
Comprehensive (loss) income | (12,290) | 67,576 | (87,568)
Closed operations |  | (2,607) | (517)
Other (expense) income | 203,365 | 10,656 | (131,915)
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member] |  |  |
Revenues | (305,835) | (369,162) | (287,941)
Revenues | 305,835 | 369,162 | 287,941
Cost of sales | (158,135) | (202,475) | (191,494)
Depreciation, depletion, and amortization | (58,774) | (65,032) | (69,004)
General and administrative | (15,690) | (20,425) | (14,508)
Exploration and pre-development | (11,600) | (6,640) | (7,177)
Research and development | (3,276) |  |
Gain (loss) on derivative contracts |  |  |
Acquisition costs |  |  |
Equity in earnings of subsidiaries |  |  |
Other (expense) income | (29,735) | 11,400 | 22,537
Income (loss) before income taxes | 28,625 | 85,956 | 26,650
(Provision) benefit from income taxes | (208,793) | (25,334) | (7,251)
Net (loss) income | (180,168) | 60,622 | 19,399
Series B Preferred Stock dividends declared |  |  |
(Loss) income applicable to common stockholders | (180,168) | 60,622 | 19,399
Changes in comprehensive (loss) income | 296 | 8 | (467)
Comprehensive (loss) income | (179,872) | 60,630 | 18,932
Closed operations |  | (34) | (1,645)
Other (expense) income | (29,735) | 11,400 | 22,537
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member] |  |  |
Revenues | (277,923) | (291,032) | (149,432)
Revenues | 277,923 | 291,032 | 149,432
Cost of sales | (147,690) | (135,850) | (100,884)
Depreciation, depletion, and amortization | (57,288) | (51,094) | (43,674)
General and administrative | (2,228) | (1,353) | (1,773)
Exploration and pre-development | (16,899) | (10,913) | (14,154)
Research and development |  |  |
Gain (loss) on derivative contracts |  |  |
Acquisition costs | (1) |  |
Equity in earnings of subsidiaries |  |  |
Other (expense) income | (42,622) | (36,074) | 36,090
Income (loss) before income taxes | 11,195 | 55,694 | 25,037
(Provision) benefit from income taxes | (13,600) | (21,438) | 5,129
Net (loss) income | (2,405) | 34,256 | 30,166
Series B Preferred Stock dividends declared |  |  |
(Loss) income applicable to common stockholders | (2,405) | 34,256 | 30,166
Changes in comprehensive (loss) income | 2,486 | 2,657 | 259
Comprehensive (loss) income | 81 | 36,913 | 30,425
Closed operations |  | (54) |
Other (expense) income | (42,622) | (36,074) | 36,090
Consolidation, Eliminations [Member] |  |  |
Revenues |  |  |
Revenues |  |  |
Cost of sales |  |  |
Depreciation, depletion, and amortization |  |  |
General and administrative |  |  |
Exploration and pre-development |  |  |
Research and development |  |  |
Gain (loss) on derivative contracts |  |  |
Acquisition costs |  |  |
Equity in earnings of subsidiaries | 182,573 | (94,878) | (49,565)
Other (expense) income | (202,514) | (19,344) | 54,188
Income (loss) before income taxes | (19,941) | (114,222) | 4,623
(Provision) benefit from income taxes | 202,514 | 19,344 | (54,188)
Net (loss) income | 182,573 | (94,878) | (49,565)
Series B Preferred Stock dividends declared |  |  |
(Loss) income applicable to common stockholders | 182,573 | (94,878) | (49,565)
Changes in comprehensive (loss) income | (2,782) | (2,665) | 208
Comprehensive (loss) income | 179,791 | (97,543) | (49,357)
Closed operations |  |  |
Other (expense) income | $ (202,514) | $ (19,344) | $ 54,188

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