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Note 13 - Guarantor Subsidiaries (Tables)
 9 Months Ended
Sep. 30, 2017
Notes Tables  
Condensed Balance Sheet [Table Text Block]
   
As of September 30, 2017
  
   
Parent
    
Guarantors
    
Non-Guarantors
    
Eliminations
    
Consolidated
  
   
(in thousands)
  
Assets
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Cash and cash equivalents
   $
101,061
     $
18,124
     $
53,738
     $
—
     $
172,923
  
Other current assets
    
47,514
      
51,190
      
40,283
      
(575
)
    
138,412
  
Properties, plants, and equipment - net
    
1,964
      
1,248,762
      
774,881
      
—
      
2,025,607
  
Intercompany receivable (payable)
    
461,542
      
(222,677
)
    
(351,019
)
    
112,154
      
—
  
Investments in subsidiaries
    
1,491,449
      
—
      
—
      
(1,491,449
)
    
—
  
Other non-current assets
    
6,321
      
199,794
      
6,906
      
(153,780
)
    
59,241
  
Total assets
   $
2,109,851
     $
1,295,193
     $
524,789
     $
(1,533,650
)
   $
2,396,183
  
Liabilities and Stockholders' Equity
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Current liabilities
   $
46,720
     $
56,189
     $
38,183
     $
(25,295
)
   $
115,797
  
Long-term debt
    
501,917
      
3,115
      
4,321
      
—
      
509,353
  
Non-current portion of accrued reclamation
    
—
      
61,964
      
18,794
      
—
      
80,758
  
Non-current deferred tax liability
    
—
      
13,349
      
126,280
      
(16,906
)
    
122,723
  
Other non-current liabilities
    
48,273
      
5,363
      
975
      
—
      
54,611
  
Shareholders' equity
    
1,512,941
      
1,155,213
      
336,236
      
(1,491,449
)
    
1,512,941
  
Total liabilities and stockholders' equity
   $
2,109,851
     $
1,295,193
     $
524,789
     $
(1,533,650
)
   $
2,396,183
  
   
As of December 31, 2016
  
   
Parent
    
Guarantors
    
Non-Guarantors
    
Eliminations
    
Consolidated
  
   
(in thousands)
  
Assets
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Cash and cash equivalents
   $
113,275
     $
24,388
     $
32,114
     $
—
     $
169,777
  
Other current assets
    
33,950
      
52,400
      
35,537
      
(573
)
    
121,314
  
Properties, plants, and equipment - net
    
2,103
      
1,258,890
      
771,692
      
—
      
2,032,685
  
Intercompany receivable (payable)
    
404,121
      
(222,072
)
    
(307,018
)
    
124,969
      
—
  
Investments in subsidiaries
    
1,496,787
      
—
      
—
      
(1,496,787
)
    
—
  
Other non-current assets
    
4,186
      
199,957
      
5,337
      
(161,579
)
    
47,901
  
Total assets
   $
2,054,422
     $
1,313,563
     $
537,662
     $
(1,533,970
)
   $
2,371,677
  
Liabilities and Stockholders' Equity
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Current liabilities
   $
22,401
     $
86,730
     $
40,093
     $
(22,999
)
   $
126,225
  
Long-term debt
    
500,979
      
3,065
      
2,773
      
—
      
506,817
  
Non-current portion of accrued reclamation
    
—
      
63,025
      
16,902
      
—
      
79,927
  
Non-current deferred tax liability
    
—
      
14,212
      
122,855
      
(14,212
)
    
122,855
  
Other non-current liabilities
    
51,198
      
5,108
      
(325
)
    
28
      
56,009
  
Stockholders' equity
    
1,479,844
      
1,141,423
      
355,364
      
(1,496,787
)
    
1,479,844
  
Total liabilities and stockholders' equity
   $
2,054,422
     $
1,313,563
     $
537,662
     $
(1,533,970
)
   $
2,371,677
  
Condensed Income Statement [Table Text Block]
   
Three Months Ended September 30, 2017
  
   
Parent
    
Guarantors
    
Non-Guarantors
    
Eliminations
    
Consolidated
  
   
(in thousands)
  
Revenues
   $
(626
)
   $
61,887
     $
79,578
     $
—
     $
140,839
  
Cost of sales
    
687
      
(29,320
)
    
(39,725
)
    
—
      
(68,358
)
Depreciation, depletion, amortization
    
—
      
(12,607
)
    
(16,237
)
    
—
      
(28,844
)
General and administrative
    
(4,217
)
    
(4,464
)
    
(848
)
    
—
      
(9,529
)
Exploration and pre-development
    
(129
)
    
(4,339
)
    
(4,544
)
    
—
      
(9,012
)
Research and development
    
—
      
(1,130
)
    
—
      
—
      
(1,130
)
Loss on derivative contracts
    
(11,226
)
    
—
      
—
      
—
      
(11,226
)
Foreign exchange gain (loss)
    
12,153
      
—
      
(16,917
)
    
—
      
(4,764
)
Lucky Friday suspension-related costs
    
—
      
(4,780
)
    
—
      
—
      
(4,780
)
Equity in earnings of subsidiaries
    
(6,271
)
    
—
      
—
      
6,271
      
—
  
Other (expense) income
    
11,041
      
1,202
      
(4,676
)
    
(14,752
)
    
(7,185
)
Income (loss) before income taxes
    
1,412
      
6,449
      
(3,369
)
    
(8,481
)
    
(3,989
)
(Provision) benefit from income taxes
    
—
      
(1,338
)
    
(8,013
)
    
14,752
      
5,401
  
Net income (loss)
    
1,412
      
5,111
      
(11,382
)
    
6,271
      
1,412
  
Preferred stock dividends
    
(138
)
    
—
      
—
      
—
      
(138
)
Income (loss) applicable to common shareholders
    
1,274
      
5,111
      
(11,382
)
    
6,271
      
1,274
  
Net income (loss)
    
1,412
      
5,111
      
(11,382
)
    
6,271
      
1,412
  
Changes in comprehensive income (loss)
    
7,636
      
—
      
1,022
      
(1,022
)
    
7,636
  
Comprehensive income (loss)
   $
9,048
     $
5,111
     $
(10,360
)
   $
5,249
     $
9,048
  
   
Nine Months Ended September 30, 2017
  
   
Parent
    
Guarantors
    
Non-Guarantors
    
Eliminations
    
Consolidated
  
   
(in thousands)
  
Revenues
   $
(3,912
)
   $
215,184
     $
206,390
     $
—
     $
417,662
  
Cost of sales
    
353
      
(112,908
)
    
(111,982
)
    
—
      
(224,537
)
Depreciation, depletion, amortization
    
—
      
(41,875
)
    
(41,490
)
    
—
      
(83,365
)
General and administrative
    
(16,407
)
    
(10,877
)
    
(1,760
)
    
—
      
(29,044
)
Exploration and pre-development
    
(439
)
    
(8,736
)
    
(12,508
)
    
—
      
(21,683
)
Research and development
    
—
      
(2,125
)
    
—
      
—
      
(2,125
)
Loss on derivative contracts
    
(16,548
)
    
—
      
—
      
—
      
(16,548
)
Foreign exchange gain (loss)
    
22,286
      
(43
)
    
(33,152
)
    
—
      
(10,909
)
Lucky Friday suspension-related costs
    
—
      
(14,385
)
    
—
      
—
      
(14,385
)
Equity in earnings of subsidiaries
    
(5,925
)
    
—
      
—
      
5,925
      
—
  
Other (expense) income
    
24,822
      
(1,207
)
    
(14,146
)
    
(38,682
)
    
(29,213
)
Income (loss) before income taxes
    
4,230
      
23,028
      
(8,648
)
    
(32,757
)
    
(14,147
)
(Provision) benefit from income taxes
    
—
      
(9,239
)
    
(11,066
)
    
38,682
      
18,377
  
Net income (loss)
    
4,230
      
13,789
      
(19,714
)
    
5,925
      
4,230
  
Preferred stock dividends
    
(414
)
    
—
      
—
      
—
      
(414
)
Income (loss) applicable to common shareholders
    
3,816
      
13,789
      
(19,714
)
    
5,925
      
3,816
  
Net income (loss)
    
4,230
      
13,789
      
(19,714
)
    
5,925
      
4,230
  
Changes in comprehensive income (loss)
    
13,718
      
—
      
1,780
      
(1,780
)
    
13,718
  
Comprehensive income (loss)
   $
17,948
     $
13,789
     $
(17,934
)
   $
4,145
     $
17,948
  
   
Three Months Ended September 30, 2016
  
   
Parent
    
Guarantors
    
Non-Guarantors
    
Eliminations
    
Consolidated
  
   
(in thousands)
  
Revenues
   $
(4,072
)
   $
116,016
     $
67,449
     $
—
     $
179,393
  
Cost of sales
    
—
      
(58,844
)
    
(31,685
)
    
—
      
(90,529
)
Depreciation, depletion, amortization
    
—
      
(19,036
)
    
(11,143
)
    
—
      
(30,179
)
General and administrative
    
(5,355
)
    
(5,469
)
    
(331
)
    
—
      
(11,155
)
Exploration and pre-development
    
(33
)
    
(1,343
)
    
(3,033
)
    
—
      
(4,409
)
Gain on derivative contracts
    
7
      
—
      
—
      
—
      
7
  
Acquisition costs
    
(1,766
)
    
1
      
—
      
—
      
(1,765
)
Equity in earnings of subsidiaries
    
52,606
      
—
      
—
      
(52,606
)
    
—
  
Other expense
    
(15,597
)
    
1,187
      
1,211
      
7,078
      
(6,121
)
Income (loss) before income taxes
    
25,790
      
32,512
      
22,468
      
(45,528
)
    
35,242
  
(Provision) benefit from income taxes
    
—
      
(8,994
)
    
6,621
      
(7,080
)
    
(9,453
)
Net income (loss)
    
25,790
      
23,518
      
29,089
      
(52,608
)
    
25,789
  
Preferred stock dividends
    
(138
)
    
—
      
—
      
—
      
(138
)
Income (loss) applicable to common shareholders
    
25,652
      
23,518
      
29,089
      
(52,608
)
    
25,651
  
Net income (loss)
    
25,790
      
23,518
      
29,089
      
(52,608
)
    
25,789
  
Changes in comprehensive income (loss)
    
(615
)
    
—
      
985
      
(985
)
    
(615
)
Comprehensive income (loss)
   $
25,175
     $
23,518
     $
30,074
     $
(53,593
)
   $
25,174
  
   
Nine Months Ended September 30, 2016
  
   
Parent
    
Guarantors
    
Non-Guarantors
    
Eliminations
    
Consolidated
  
   
(in thousands)
  
Revenues
   $
(15,866
)
   $
285,277
     $
212,301
     $
—
     $
481,712
  
Cost of sales
    
—
      
(154,160
)
    
(95,002
)
    
—
      
(249,162
)
Depreciation, depletion, amortization
    
—
      
(49,521
)
    
(35,071
)
    
—
      
(84,592
)
General and administrative
    
(17,069
)
    
(13,671
)
    
(988
)
    
—
      
(31,728
)
Exploration and pre-development
    
(191
)
    
(3,990
)
    
(7,465
)
    
—
      
(11,646
)
Acquisition costs
    
(2,160
)
    
(7
)
    
—
      
—
      
(2,167
)
Equity in earnings of subsidiaries
    
68,727
      
—
      
—
      
(68,727
)
    
—
  
Other (expense) income
    
15,844
      
8,147
      
(43,039
)
    
(11,481
)
    
(30,529
)
Income (loss) before income taxes
    
49,285
      
72,075
      
30,736
      
(80,208
)
    
71,888
  
(Provision) benefit from income taxes
    
—
      
(22,213
)
    
(11,871
)
    
11,481
      
(22,603
)
Net income (loss)
    
49,285
      
49,862
      
18,865
      
(68,727
)
    
49,285
  
Preferred stock dividends
    
(414
)
    
—
      
—
      
—
      
(414
)
Income (loss) applicable to common shareholders
    
48,871
      
49,862
      
18,865
      
(68,727
)
    
48,871
  
Net income (loss)
    
49,285
      
49,862
      
18,865
      
(68,727
)
    
49,285
  
Changes in comprehensive income (loss)
    
1,689
      
8
      
3,238
      
(3,246
)
    
1,689
  
Comprehensive income (loss)
   $
50,974
     $
49,870
     $
22,103
     $
(71,973
)
   $
50,974
  
Condensed Cash Flow Statement [Table Text Block]
   
Nine Months Ended September 30, 2017
  
   
Parent
    
Guarantors
    
Non-Guarantors
    
Eliminations
    
Consolidated
  
                                         
Cash flows from operating activities
   $
35,764
     $
41,071
     $
21,435
     $
(24,155
)
   $
74,115
  
Cash flows from investing activities:
                                        
Additions to properties, plants, and equipment
    
—
      
(28,220
)
    
(42,170
)
    
—
      
(70,390
)
Other investing activities, net
    
176
      
6,903
      
(584
)
    
(5,339
)
    
1,156
  
Cash flows from financing activities:
                                        
Dividends paid to shareholders
    
(3,392
)
    
—
      
—
      
—
      
(3,392
)
Proceeds from (payments on) debt
    
—
      
(4,518
)
    
(1,017
)
    
—
      
(5,535
)
Other financing activity, net
    
(44,762
)
    
(21,500
)
    
42,909
      
29,494
      
6,141
  
Effect of exchange rates on cash
    
—
      
—
      
1,051
      
—
      
1,051
  
Changes in cash and cash equivalents
    
(12,214
)
    
(6,264
)
    
21,624
      
—
      
3,146
  
Beginning cash and cash equivalents
    
113,275
      
24,388
      
32,114
      
—
      
169,777
  
Ending cash and cash equivalents
   $
101,061
     $
18,124
     $
53,738
     $
—
     $
172,923
  
   
Nine Months Ended September 30, 2016
  
   
Parent
    
Guarantors
    
Non-Guarantors
    
Eliminations
    
Consolidated
  
   
(in thousands)
  
Cash flows from operating activities
   $
14,525
     $
51,599
     $
61,710
     $
45,280
     $
173,114
  
Cash flows from investing activities:
                                        
Additions to properties, plants, and equipment
    
(348
)
    
(71,265
)
    
(48,623
)
    
—
      
(120,236
)
Acquisitions of other companies, net of cash acquired
    
(3,931
)
    
 
      
—
      
—
      
(3,931
)
Other investing activities, net
    
(24,696
)
    
(816
)
    
(3,647
)
    
—
      
(29,159
)
Cash flows from financing activities:
                                        
Dividends paid to shareholders
    
(3,296
)
    
—
      
—
      
—
      
(3,296
)
Proceeds from (payments on) debt
    
—
      
(7,477
)
    
(658
)
    
—
      
(8,135
)
Other financing activity, net
    
33,335
      
24,522
      
(8,926
)
    
(45,280
)
    
3,651
  
Effect of exchange rates on cash
    
—
      
—
      
627
      
—
      
627
  
Changes in cash and cash equivalents
    
15,589
      
(3,437
)
    
483
      
—
      
12,635
  
Beginning cash and cash equivalents
    
94,167
      
42,692
      
18,350
      
—
      
155,209
  
Ending cash and cash equivalents
   $
109,756
     $
39,255
     $
18,833
     $
—
     $
167,844