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Note 13 - Guarantor Subsidiaries - Unaudited Interim Condensed Consolidating Statements of Operations (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Income (loss) applicable to common stockholders $ (24,154) $ 23,978 $ 2,542 $ 23,222
Changes in comprehensive income (loss) 2,878 1,239 6,082 2,304
Comprehensive income (loss) (21,138) 25,355 8,900 25,802
Revenues 134,279 171,302 276,823 302,319
Cost of sales (77,503) (82,953) (156,179) (157,273)
Depreciation, depletion, amortization (25,569) (29,897) (54,521) (55,772)
General and administrative (10,309) (10,359) (19,515) (20,573)
Exploration and pre-development (6,905) (3,883) (12,671) (7,237)
Research and development (312) (995)
Loss on derivative contracts   (6)   (402)
Gain (loss) on derivative contracts 2,487 (6) (5,322) (6)
Foreign exchange gain (loss) (3,883) (1,885) (6,145) (10,088)
Lucky Friday suspension-related costs (8,024) (9,605)
Equity in earnings of subsidiaries
Other (expense) income (12,182) (8,190) (22,028) (24,408)
Income (loss) before income taxes (7,921) 35,612 (10,158) 36,648
(Provision) benefit from income taxes (16,095) (11,496) 12,976 (13,150)
Net income (loss) (24,016) 24,116 2,818 23,498
Preferred stock dividends (138) (138) (276) (276)
Reportable Legal Entities [Member] | Parent Company [Member]        
Income (loss) applicable to common stockholders (26,621) 23,978 2,542 23,222
Changes in comprehensive income (loss) 2,878 1,239 6,082 2,304
Comprehensive income (loss) (23,605) 25,355 8,900 25,802
Revenues 807 (5,659) (3,286) (11,794)
Cost of sales (186) (334)
Depreciation, depletion, amortization
General and administrative (5,721) (6,474) (12,190) (11,714)
Exploration and pre-development (66) (113) (310) (158)
Research and development    
Loss on derivative contracts   (6)   (394)
Gain (loss) on derivative contracts 2,487 (394) (5,322) (6)
Foreign exchange gain (loss) 7,666   10,133  
Lucky Friday suspension-related costs    
Equity in earnings of subsidiaries (2,355) 37,111 346 16,120
Other (expense) income (29,115) (349) 13,781 31,444
Income (loss) before income taxes (26,483) 24,116 2,818 23,498
(Provision) benefit from income taxes
Net income (loss) (26,483) 24,116 2,818 23,498
Preferred stock dividends (138) (138) (276) (276)
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member]        
Income (loss) applicable to common stockholders 612 14,741 8,678 26,344
Changes in comprehensive income (loss) 8
Comprehensive income (loss) 612 14,741 8,678 26,352
Revenues 70,344 87,992 153,297 169,261
Cost of sales (40,816) (47,203) (83,588) (93,956)
Depreciation, depletion, amortization (13,502) (15,238) (29,268) (31,844)
General and administrative (4,094) (3,679) (6,413) (8,202)
Exploration and pre-development (2,496) (1,360) (4,397) (2,647)
Research and development (312)   (995)  
Loss on derivative contracts     (8)
Gain (loss) on derivative contracts (8)
Foreign exchange gain (loss) 1   (43)  
Lucky Friday suspension-related costs (8,024)   (9,605)  
Equity in earnings of subsidiaries
Other (expense) income (1,557) 2,623 (2,409) 6,959
Income (loss) before income taxes (456) 23,127 16,579 39,563
(Provision) benefit from income taxes 1,068 (8,386) (7,901) (13,219)
Net income (loss) 612 14,741 8,678 26,344
Preferred stock dividends
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member]        
Income (loss) applicable to common stockholders (500) 22,370 (8,332) (10,224)
Changes in comprehensive income (loss) 847 1,193 758 2,253
Comprehensive income (loss) 347 23,563 (7,574) (7,971)
Revenues 63,128 88,969 126,812 144,852
Cost of sales (36,501) (35,750) (72,257) (63,317)
Depreciation, depletion, amortization (12,067) (14,659) (25,253) (23,928)
General and administrative (494) (206) (912) (657)
Exploration and pre-development (4,343) (2,410) (7,964) (4,432)
Research and development    
Loss on derivative contracts    
Gain (loss) on derivative contracts
Foreign exchange gain (loss) (11,550)   (16,235)  
Lucky Friday suspension-related costs    
Equity in earnings of subsidiaries
Other (expense) income (2,400) (8,732) (9,470) (44,250)
Income (loss) before income taxes (4,227) 27,212 (5,279) 8,268
(Provision) benefit from income taxes 3,727 (4,842) (3,053) (18,492)
Net income (loss) (500) 22,370 (8,332) (10,224)
Preferred stock dividends
Consolidation, Eliminations [Member]        
Income (loss) applicable to common stockholders 2,355 (37,111) (346) (16,120)
Changes in comprehensive income (loss) (847) (1,193) (758) (2,261)
Comprehensive income (loss) 1,508 (38,304) (1,104) (18,381)
Revenues
Cost of sales
Depreciation, depletion, amortization
General and administrative
Exploration and pre-development
Research and development    
Loss on derivative contracts    
Gain (loss) on derivative contracts
Foreign exchange gain (loss)    
Lucky Friday suspension-related costs    
Equity in earnings of subsidiaries 2,355 (37,111) (346) (16,120)
Other (expense) income 20,890 (1,732) (23,930) (18,561)
Income (loss) before income taxes 23,245 (38,843) (24,276) (34,681)
(Provision) benefit from income taxes (20,890) 1,732 23,930 18,561
Net income (loss) 2,355 (37,111) (346) (16,120)
Preferred stock dividends