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Note 14 - Guarantor Subsidiaries (Tables)
 3 Months Ended
Mar. 31, 2018
Notes Tables  
Condensed Balance Sheet [Table Text Block]
   
As of March 31, 2018
  
   
Parent
    
Guarantors
    
Non-
Guarantors
    
Eliminations
    
Consolidated
  
   
(in thousands)
  
Assets
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Cash and cash equivalents
   $
137,504
     $
21,096
     $
53,969
     $
—
     $
212,569
  
Other current assets
    
48,067
      
55,771
      
49,767
      
(69
)
    
153,536
  
Properties, plants, and equipment - net
    
1,934
      
1,241,325
      
765,445
      
—
      
2,008,704
  
Intercompany receivable (payable)
    
293,972
      
(163,503
)
    
(338,811
)
    
208,342
      
—
  
Investments in subsidiaries
    
1,373,604
      
—
      
—
      
(1,373,604
)
    
—
  
Other non-current assets
    
13,807
      
7,370
      
8,325
      
(6,220
)
    
23,282
  
Total assets
   $
1,868,888
     $
1,162,059
     $
538,695
     $
(1,171,551
)
   $
2,398,091
  
Liabilities and Stockholders' Equity
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Current liabilities
   $
(203,947
)
   $
67,735
     $
38,776
     $
213,370
     $
115,934
  
Long-term debt
    
533,566
      
3,682
      
3,412
      
—
      
540,660
  
Non-current portion of accrued reclamation
    
—
      
66,614
      
12,273
      
—
      
78,887
  
Non-current deferred tax liability
    
—
      
11,630
      
116,553
      
(11,317
)
    
116,866
  
Other non-current liabilities
    
44,768
      
5,384
      
1,091
      
—
      
51,243
  
Stockholders' equity
    
1,494,501
      
1,007,014
      
366,590
      
(1,373,604
)
    
1,494,501
  
Total liabilities and stockholders' equity
   $
1,868,888
     $
1,162,059
     $
538,695
     $
(1,171,551
)
   $
2,398,091
  
   
As of December 31, 2017
  
   
Parent
    
Guarantors
    
Non-
Guarantors
    
Eliminations
    
Consolidated
  
   
(in thousands)
  
Assets
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Cash and cash equivalents
   $
103,878
     $
31,016
     $
51,213
     $
—
     $
186,107
  
Other current assets
    
47,555
      
47,608
      
39,630
      
(575
)
    
134,218
  
Properties, plants, and equipment - net
    
1,946
      
1,244,161
      
773,914
      
—
      
2,020,021
  
Intercompany receivable (payable)
    
287,310
      
(177,438
)
    
(341,182
)
    
231,310
      
—
  
Investments in subsidiaries
    
1,358,025
      
—
      
—
      
(1,358,025
)
    
—
  
Other non-current assets
    
14,409
      
7,289
      
9,283
      
(6,370
)
    
24,611
  
Total assets
   $
1,813,123
     $
1,152,636
     $
532,858
     $
(1,133,660
)
   $
2,364,957
  
Liabilities and Stockholders' Equity
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Current liabilities
   $
(226,576
)
   $
66,550
     $
37,671
     $
234,485
     $
112,130
  
Long-term debt
    
502,229
      
2,303
      
3,890
      
—
      
508,422
  
Non-current portion of accrued reclamation
    
—
      
67,565
      
11,801
      
—
      
79,366
  
Non-current deferred tax liability
    
—
      
10,120
      
121,546
      
(10,120
)
    
121,546
  
Other non-current liabilities
    
53,588
      
5,185
      
838
      
—
      
59,611
  
Stockholders' equity
    
1,483,882
      
1,000,913
      
357,112
      
(1,358,025
)
    
1,483,882
  
Total liabilities and stockholders' equity
   $
1,813,123
     $
1,152,636
     $
532,858
     $
(1,133,660
)
   $
2,364,957
  
Condensed Income Statement [Table Text Block]
   
Three Months Ended March 31, 2018
  
   
Parent
    
Guarantors
    
Non-
Guarantors
    
Eliminations
    
Consolidated
  
   
(in thousands)
  
Revenues
   $
615
     $
70,211
     $
68,883
     $
—
     $
139,709
  
Cost of sales
    
475
      
(34,701
)
    
(38,643
)
    
—
      
(72,869
)
Depreciation, depletion, amortization
    
—
      
(11,260
)
    
(16,794
)
    
—
      
(28,054
)
General and administrative
    
(3,833
)
    
(3,448
)
    
(454
)
    
—
      
(7,735
)
Exploration and pre-development
    
(55
)
    
(1,939
)
    
(6,371
)
    
—
      
(8,365
)
Research and development
    
—
      
(482
)
    
(954
)
    
—
      
(1,436
)
Gain on derivative contracts
    
4,007
      
—
      
—
      
—
      
4,007
  
Acquisition costs
    
(2,360
)
    
—
      
(147
)
    
—
      
(2,507
)
Equity in earnings of subsidiaries
    
17,768
      
—
      
—
      
(17,768
)
    
—
  
Other (expense) income
    
(8,377
)
    
(6,794
)
    
6,917
      
(5,488
)
    
(13,742
)
Income (loss) before income taxes
    
8,240
      
11,587
      
12,437
      
(23,256
)
    
9,008
  
(Provision) benefit from income taxes
    
—
      
(5,488
)
    
(768
)
    
5,488
      
(768
)
Net income (loss)
    
8,240
      
6,099
      
11,669
      
(17,768
)
    
8,240
  
Preferred stock dividends
    
(138
)
    
—
      
—
      
—
      
(138
)
Income (loss) applicable to common stockholders
    
8,102
      
6,099
      
11,669
      
(17,768
)
    
8,102
  
Net income (loss)
    
8,240
      
6,099
      
11,669
      
(17,768
)
    
8,240
  
Changes in comprehensive income (loss)
    
(2,104
)
    
—
      
38
      
(38
)
    
(2,104
)
Comprehensive income (loss)
   $
6,136
     $
6,099
     $
11,707
     $
(17,806
)
   $
6,136
  
   
Three Months Ended March 31, 2017
  
   
Parent
    
Guarantors
    
Non-
Guarantors
    
Eliminations
    
Consolidated
  
   
(in thousands)
  
Revenues
   $
(4,093
)
   $
82,953
     $
63,684
     $
—
     $
142,544
  
Cost of sales
    
(148
)
    
(42,772
)
    
(35,756
)
    
—
      
(78,676
)
Depreciation, depletion, amortization
    
—
      
(15,766
)
    
(13,186
)
    
—
      
(28,952
)
General and administrative
    
(6,469
)
    
(2,319
)
    
(418
)
    
—
      
(9,206
)
Exploration and pre-development
    
(244
)
    
(1,901
)
    
(3,621
)
    
—
      
(5,766
)
Gain on derivative contracts
    
(7,809
)
    
—
      
—
      
—
      
(7,809
)
Equity in earnings of subsidiaries
    
2,701
      
—
      
—
      
(2,701
)
    
—
  
Other (expense) income
    
42,896
      
(3,116
)
    
(9,332
)
    
(44,820
)
    
(14,372
)
Income (loss) before income taxes
    
26,834
      
17,079
      
1,371
      
(47,521
)
    
(2,237
)
(Provision) benefit from income taxes
    
—
      
(8,969
)
    
(6,780
)
    
44,820
      
29,071
  
Net income (loss)
    
26,834
      
8,110
      
(5,409
)
    
(2,701
)
    
26,834
  
Preferred stock dividends
    
(138
)
    
—
      
—
      
—
      
(138
)
Income (loss) applicable to common stockholders
    
26,696
      
8,110
      
(5,409
)
    
(2,701
)
    
26,696
  
Net income (loss)
    
26,834
      
8,110
      
(5,409
)
    
(2,701
)
    
26,834
  
Changes in comprehensive income (loss)
    
3,204
      
—
      
(89
)
    
89
      
3,204
  
Comprehensive income (loss)
   $
30,038
     $
8,110
     $
(5,498
)
   $
(2,612
)
   $
30,038
  
Condensed Cash Flow Statement [Table Text Block]
   
Three Months Ended March 31, 2018
  
   
Parent
    
Guarantors
    
Non-
Guarantors
    
Eliminations
    
Consolidated
  
   
(in thousands)
  
Cash flows from operating activities
   $
21,183
     $
18,747
     $
13,396
     $
(36,943
)
   $
16,383
  
Cash flows from investing activities:
                                        
Additions to properties, plants, and equipment
    
—
      
(8,082
)
    
(9,553
)
    
—
      
(17,635
)
Other investing activities, net
    
(16,260
)
    
151
      
—
      
15,579
      
(530
)
Cash flows from financing activities:
                                        
Dividends paid to stockholders
    
(1,136
)
    
—
      
—
      
—
      
(1,136
)
Borrowings on debt    
31,024
      
—
      
—
      
—
      
31,024
  
Payments on debt
    
—
      
(644
)
    
(678
)
    
—
      
(1,322
)
Other financing activity
    
(1,186
)
    
(20,118
)
    
(1,285
)
    
21,364
      
(1,225
)
Effect of exchange rate changes on cash
    
—
      
—
      
876
      
—
      
876
  
Changes in cash, cash equivalents and restricted cash and cash equivalents
    
33,625
      
(9,946
)
    
2,756
      
—
      
26,435
  
Beginning cash, cash equivalents and restricted cash and cash equivalents
    
103,878
      
32,048
      
51,213
      
—
      
187,139
  
Ending cash, cash equivalents and restricted cash and cash equivalents
   $
137,503
     $
22,102
     $
53,969
     $
—
     $
213,574
  
   
Three Months Ended March 31, 2017
  
   
Parent
    
Guarantors
    
Non-
Guarantors
    
Eliminations
    
Consolidated
  
   
(in thousands)
  
Cash flows from operating activities
   $
40,953
     $
11,508
     $
15,642
     $
(29,818
)
   $
38,285
  
Cash flows from investing activities:
                                        
Additions to properties, plants, and equipment
    
—
      
(7,540
)
    
(14,118
)
    
—
      
(21,658
)
Other investing activities, net
    
(7,479
)
    
61
      
—
      
—
      
(7,418
)
Cash flows from financing activities:
                                        
Dividends paid to stockholders
    
(1,127
)
    
—
      
—
      
—
      
(1,127
)
Payments on debt
    
—
      
(1,658
)
    
(407
)
    
—
      
(2,065
)
Other financing activity
    
(41,096
)
    
3,025
      
7,431
      
29,818
      
(822
)
Effect of exchange rate changes on cash
    
—
      
—
      
1,814
      
—
      
1,814
  
Changes in cash, cash equivalents and restricted cash and cash equivalents
    
(8,749
)
    
5,396
      
10,362
      
—
      
7,009
  
Beginning cash, cash equivalents and restricted cash and cash equivalents
    
113,275
      
26,588
      
32,114
      
—
      
171,977
  
Ending cash, cash equivalents and restricted cash and cash equivalents
   $
104,526
     $
31,984
     $
42,476
     $
—
     $
178,986