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Note 13 - Guarantor Subsidiaries - Unaudited Interim Condensed Consolidating Statements of Operations (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Revenues $ (140,839) $ (179,393) $ (417,662) $ (481,712)
Revenues 140,839 179,393 417,662 481,712
Cost of sales (68,358) (90,529) (224,537) (249,162)
Depreciation, depletion, amortization (28,844) (30,179) (83,365) (84,592)
General and administrative (9,529) (11,155) (29,044) (31,728)
Exploration and pre-development (9,012) (4,409) (21,683) (11,646)
Research and development (1,130) (2,125)
Loss on derivative contracts (11,226) 7 (16,548)
Foreign exchange gain (loss) (4,764) 2,375 (10,909) (7,713)
Lucky Friday suspension-related costs (4,780) (14,385)
Equity in earnings of subsidiaries
Other (expense) income (7,185) (6,121) (29,213) (30,529)
Income (loss) before income taxes (3,989) 35,242 (14,147) 71,888
(Provision) benefit from income taxes 5,401 (9,453) 18,377 (22,603)
Net income (loss) 1,412 25,789 4,230 49,285
Preferred stock dividends (138) (138) (414) (414)
Income (loss) applicable to common shareholders 1,274 25,651 3,816 48,871
Changes in comprehensive income (loss) 7,636 (615) 13,718 1,689
Comprehensive income (loss) 9,048 25,174 17,948 50,974
Acquisition costs (1,765) (2,167)
Income (loss) applicable to common shareholders 1,274 25,651 3,816 48,871
Reportable Legal Entities [Member] | Parent Company [Member]        
Revenues (626) (4,072) (3,912) (15,866)
Revenues 626 4,072 3,912 15,866
Cost of sales 687 353
Depreciation, depletion, amortization
General and administrative (4,217) (5,355) (16,407) (17,069)
Exploration and pre-development (129) (33) (439) (191)
Research and development    
Loss on derivative contracts (11,226) 7 (16,548)  
Foreign exchange gain (loss) 12,153   22,286  
Lucky Friday suspension-related costs    
Equity in earnings of subsidiaries (6,271) 52,606 (5,925) 68,727
Other (expense) income 11,041 (15,597) 24,822 15,844
Income (loss) before income taxes 1,412 25,790 4,230 49,285
(Provision) benefit from income taxes
Net income (loss) 1,412 25,790 4,230 49,285
Preferred stock dividends (138) (138) (414) (414)
Income (loss) applicable to common shareholders 1,274 25,652 3,816 48,871
Changes in comprehensive income (loss) 7,636 (615) 13,718 1,689
Comprehensive income (loss) 9,048 25,175 17,948 50,974
Acquisition costs   (1,766)   (2,160)
Income (loss) applicable to common shareholders 1,274 25,652 3,816 48,871
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member]        
Revenues (61,887) (116,016) (215,184) (285,277)
Revenues 61,887 116,016 215,184 285,277
Cost of sales (29,320) (58,844) (112,908) (154,160)
Depreciation, depletion, amortization (12,607) (19,036) (41,875) (49,521)
General and administrative (4,464) (5,469) (10,877) (13,671)
Exploration and pre-development (4,339) (1,343) (8,736) (3,990)
Research and development (1,130)   (2,125)  
Loss on derivative contracts  
Foreign exchange gain (loss)   (43)  
Lucky Friday suspension-related costs (4,780)   (14,385)  
Equity in earnings of subsidiaries
Other (expense) income 1,202 1,187 (1,207) 8,147
Income (loss) before income taxes 6,449 32,512 23,028 72,075
(Provision) benefit from income taxes (1,338) (8,994) (9,239) (22,213)
Net income (loss) 5,111 23,518 13,789 49,862
Preferred stock dividends
Income (loss) applicable to common shareholders 5,111 23,518 13,789 49,862
Changes in comprehensive income (loss) 8
Comprehensive income (loss) 5,111 23,518 13,789 49,870
Acquisition costs   1   (7)
Income (loss) applicable to common shareholders 5,111 23,518 13,789 49,862
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member]        
Revenues (79,578) (67,449) (206,390) (212,301)
Revenues 79,578 67,449 206,390 212,301
Cost of sales (39,725) (31,685) (111,982) (95,002)
Depreciation, depletion, amortization (16,237) (11,143) (41,490) (35,071)
General and administrative (848) (331) (1,760) (988)
Exploration and pre-development (4,544) (3,033) (12,508) (7,465)
Research and development    
Loss on derivative contracts  
Foreign exchange gain (loss) (16,917)   (33,152)  
Lucky Friday suspension-related costs    
Equity in earnings of subsidiaries
Other (expense) income (4,676) 1,211 (14,146) (43,039)
Income (loss) before income taxes (3,369) 22,468 (8,648) 30,736
(Provision) benefit from income taxes (8,013) 6,621 (11,066) (11,871)
Net income (loss) (11,382) 29,089 (19,714) 18,865
Preferred stock dividends
Income (loss) applicable to common shareholders (11,382) 29,089 (19,714) 18,865
Changes in comprehensive income (loss) 1,022 985 1,780 3,238
Comprehensive income (loss) (10,360) 30,074 (17,934) 22,103
Acquisition costs    
Income (loss) applicable to common shareholders (11,382) 29,089 (19,714) 18,865
Consolidation, Eliminations [Member]        
Revenues
Revenues
Cost of sales
Depreciation, depletion, amortization
General and administrative
Exploration and pre-development
Research and development    
Loss on derivative contracts  
Foreign exchange gain (loss)    
Lucky Friday suspension-related costs    
Equity in earnings of subsidiaries 6,271 (52,606) 5,925 (68,727)
Other (expense) income (14,752) 7,078 (38,682) (11,481)
Income (loss) before income taxes (8,481) (45,528) (32,757) (80,208)
(Provision) benefit from income taxes 14,752 (7,080) 38,682 11,481
Net income (loss) 6,271 (52,608) 5,925 (68,727)
Preferred stock dividends
Income (loss) applicable to common shareholders 6,271 (52,608) 5,925 (68,727)
Changes in comprehensive income (loss) (1,022) (985) (1,780) (3,246)
Comprehensive income (loss) 5,249 (53,593) 4,145 (71,973)
Acquisition costs    
Income (loss) applicable to common shareholders $ 6,271 $ (52,608) $ 5,925 $ (68,727)