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Note 14 - Guarantor Subsidiaries (Tables)
 3 Months Ended
Mar. 31, 2019
Notes Tables  
Condensed Balance Sheet [Table Text Block]
   
As of March 31, 2019
  
   
Parent
    
Guarantors
    
Non-Guarantors
    
Eliminations
    
Consolidated
  
   
(in thousands)
  
Assets
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Cash and cash equivalents
   $
3,401
     $
3,269
     $
5,127
     $
—
     $
11,797
  
Other current assets
    
6,359
      
61,293
      
64,732
      
(74
)
    
132,310
  
Properties, plants, and equipment - net
    
1,913
      
1,792,578
      
714,490
      
—
      
2,508,981
  
Intercompany receivable (payable)
    
162,575
      
(342,867
)
    
(182,748
)
    
363,040
      
—
  
Investments in subsidiaries
    
1,554,448
      
—
      
—
      
(1,554,448
)
    
—
  
Other non-current assets
    
278,379
      
23,540
      
(115,696
)
    
(144,706
)
    
41,517
  
Total assets
   $
2,007,075
     $
1,537,813
     $
485,905
     $
(1,336,188
)
   $
2,694,605
  
Liabilities and Stockholders' Equity
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Current liabilities
   $
(247,045
)
   $
118,535
     $
49,545
     $
225,786
     $
146,821
  
Long-term debt
    
533,723
      
19,682
      
3,584
      
—
      
556,989
  
Non-current portion of accrued reclamation
    
—
      
90,083
      
14,103
      
—
      
104,186
  
Non-current deferred tax liability
    
—
      
71,173
      
95,778
      
(7,526
)
    
159,425
  
Other non-current liabilities
    
49,827
      
5,871
      
916
      
—
      
56,614
  
Stockholders' equity
    
1,670,570
      
1,232,469
      
321,979
      
(1,554,448
)
    
1,670,570
  
Total liabilities and stockholders' equity
   $
2,007,075
     $
1,537,813
     $
485,905
     $
(1,336,188
 )   $
2,694,605
  
   
As of December 31, 2018
  
   
Parent
    
Guarantors
    
Non-Guarantors
    
Eliminations
    
Consolidated
  
   
(in thousands)
  
Assets
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Cash and cash equivalents
   $
6,265
     $
8,661
     $
12,463
     $
—
     $
27,389
  
Other current assets
    
6,388
      
69,574
      
60,868
      
(69
)
    
136,761
  
Properties, plants, and equipment - net
    
1,913
      
1,795,994
      
722,097
      
—
      
2,520,004
  
Intercompany receivable (payable)
    
171,905
      
(222,815
)
    
(171,834
)
    
222,744
      
—
  
Investments in subsidiaries
    
1,577,564
      
—
      
—
      
(1,577,564
)
    
—
  
Other non-current assets
    
276,641
      
9,030
      
(122,969
)
    
(142,912
)
    
19,790
  
Total assets
   $
2,040,676
     $
1,660,444
     $
500,625
     $
(1,497,801
)
   $
2,703,944
  
Liabilities and Stockholders' Equity
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Current liabilities
   $
(234,133
)
   $
118,863
     $
45,922
     $
205,542
     $
136,194
  
Long-term debt
    
532,799
      
141,870
      
1,989
      
(135,988
)
    
540,670
  
Non-current portion of accrued reclamation
    
—
      
94,602
      
10,377
      
—
      
104,979
  
Non-current deferred tax liability
    
—
      
64,639
      
98,689
      
10,209
      
173,537
  
Other non-current liabilities
    
51,047
      
5,659
      
895
      
—
      
57,601
  
Stockholders' equity
    
1,690,963
      
1,234,811
      
342,753
      
(1,577,564
)
    
1,690,963
  
Total liabilities and stockholders' equity
   $
2,040,676
     $
1,660,444
     $
500,625
     $
(1,497,801
)
   $
2,703,944
  
Condensed Income Statement [Table Text Block]
   
Three Months Ended March 31, 2019
  
   
Parent
    
Guarantors
    
Non-Guarantors
    
Eliminations
    
Consolidated
  
   
(in thousands)
  
Revenues
   $
(2,477
)
   $
102,432
     $
52,662
     $
—
     $
152,617
  
Cost of sales
    
(461
)
    
(66,869
)
    
(43,056
)
    
—
      
(110,386
)
Depreciation, depletion, amortization
    
—
      
(20,872
)
    
(17,915
)
    
—
      
(38,787
)
General and administrative
    
(4,393
)
    
(5,111
)
    
(455
)
    
—
      
(9,959
)
Exploration and pre-development
    
(16
)
    
(1,544
)
    
(3,698
)
    
—
      
(5,258
)
Research and development
    
—
      
(353
)
    
(50
)
    
—
      
(403
)
Loss on derivative contracts
    
(1,799
)
    
—
      
—
      
—
      
(1,799
)
Acquisition costs
    
42
      
(55
)
    
—
      
—
      
(13
)
Equity in earnings of subsidiaries
    
(22,433
)
    
—
      
—
      
22,433
      
—
  
Other (expense) income
    
6,004
      
(5,730
)
    
(12,642
)
    
(6,393
)
    
(18,761
)
(Loss) income before income taxes
    
(25,533
)
    
1,898
      
(25,154
)
    
16,040
      
(32,749
)
(Provision) benefit from income taxes
    
—
      
(3,916
)
    
4,739
      
6,393
      
7,216
  
Net (loss) income
    
(25,533
)
    
(2,018
)
    
(20,415
)
    
22,433
      
(25,533
)
Preferred stock dividends
    
(138
)
    
—
      
—
      
—
      
(138
)
(Loss) income applicable to common stockholders
    
(25,671
)
    
(2,018
)
    
(20,415
)
    
22,433
      
(25,671
)
Net (loss) income
    
(25,533
)
    
(2,018
)
    
(20,415
)
    
22,433
      
(25,533
)
Changes in comprehensive (loss) income
    
4,259
      
—
      
—
      
—
      
4,259
  
Comprehensive (loss) income
   $
(21,274
)
   $
(2,018
)
   $
(20,415
)
   $
22,433
     $
(21,274
)
   
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
  
Condensed Cash Flow Statement [Table Text Block]
   
Three Months Ended March 31, 2019
  
   
Parent
    
Guarantors
    
Non-Guarantors
    
Eliminations
    
Consolidated
  
   
(in thousands)
  
Cash flows from operating activities
   $
(38,879
)
   $
36,481
     $
(17,553
)
   $
39,981
     $
20,030
  
Cash flows from investing activities:
                                        
Additions to properties, plants, and equipment
    
—
      
(25,401
)
    
(7,670
)
    
—
      
(33,071
)
Other investing activities, net
    
23,116
      
(1
)
    
2
      
(23,116
)
    
1
  
Cash flows from financing activities:
                                        
Dividends paid to stockholders
    
(1,348
)
    
—
      
—
      
—
      
(1,348
)
Borrowings on debt
    
58,000
      
—
      
—
      
—
      
58,000
  
Payments on debt
    
(58,000
)
    
(746
)
    
(515
)
    
—
      
(59,261
)
Other financing activity
    
14,247
      
(15,725
)
    
18,305
      
(16,865
)
    
(38
)
Effect of exchange rate changes on cash
    
—
      
—
      
95
      
—
      
95
  
Changes in cash, cash equivalents and restricted cash and cash equivalents
    
(2,864
)
    
(5,392
)
    
(7,336
)
    
—
      
(15,592
)
Beginning cash, cash equivalents and restricted cash and cash equivalents
    
6,265
      
9,686
      
12,463
      
—
      
28,414
  
Ending cash, cash equivalents and restricted cash and cash equivalents
   $
3,401
     $
4,294
     $
5,127
     $
—
     $
12,822
  
   
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
)
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