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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