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Note 17 - Guarantor Subsidiaries (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Condensed Balance Sheet [Table Text Block]
   
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
  
   
As of December 31, 2017
  
   
Parent
    
Guarantors
    
Non-
Guarantors
    
Eliminations
    
Consolidated
  
                   
Revised
            
Revised
  
   
(in thousands)
  
Assets
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Cash and cash equivalents
   $
103,878
     $
31,016
     $
51,213
     $
—
     $
186,107
  
Other current assets
    
47,555
      
47,608
      
40,541
      
(575
)
    
135,129
  
Properties, plants, and equipment - net
    
1,946
      
1,244,161
      
753,204
      
—
      
1,999,311
  
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
     $
513,059
     $
(1,133,660
)
   $
2,345,158
  
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
      
124,352
      
(10,120
)
    
124,352
  
Other non-current liabilities
    
53,588
      
5,185
      
838
      
—
      
59,611
  
Stockholders' equity
    
1,483,882
      
1,000,913
      
334,507
      
(1,358,025
)
    
1,461,277
  
Total liabilities and stockholders' equity
   $
1,813,123
     $
1,152,636
     $
513,059
     $
(1,133,660
)
   $
2,345,158
  
Condensed Income Statement [Table Text Block]
   
Year Ended December 31, 2018
  
   
Parent
    
Guarantors
    
Non-Guarantors
    
Eliminations
    
Consolidated
  
   
(in thousands)
  
Revenues
   $
8,084
     $
298,491
     $
260,562
     $
—
     $
567,137
  
Cost of sales
    
(446
)
    
(188,567
)
    
(164,981
)
    
—
      
(353,994
)
Depreciation, depletion, and amortization
    
—
      
(58,140
)
    
(75,904
)
    
—
      
(134,044
)
General and administrative
    
(18,760
)
    
(15,761
)
    
(2,021
)
    
—
      
(36,542
)
Exploration and pre-development
    
(130
)
    
(20,514
)
    
(19,938
)
    
—
      
(40,582
)
Research and development
    
—
      
(2,893
)
    
(2,548
)
    
—
      
(5,441
)
Gain on derivative contracts
    
40,253
      
—
      
—
      
—
      
40,253
  
Acquisition costs
    
(9,445
)
    
(344
)
    
(256
)
    
—
      
(10,045
)
Equity in earnings of subsidiaries
    
(47,229
)
    
—
      
—
      
47,229
      
—
  
Other (expense) income
    
515
      
(29,302
)
    
16,212
      
(47,431
)
    
(60,006
)
(Loss) income before income taxes
    
(27,158
)
    
(17,030
)
    
11,126
      
(202
)
    
(33,264
)
(Provision) benefit from income taxes
    
595
      
(37,444
)
    
(3,881
)
    
47,431
      
6,701
  
Net (loss) income
    
(26,563
)
    
(54,474
)
    
7,245
      
47,229
      
(26,563
)
Preferred stock dividends
    
(552
)
    
—
      
—
      
—
      
(552
)
(Loss) income applicable to common stockholders
    
(27,115
)
    
(54,474
)
    
7,245
      
47,229
      
(27,115
)
Net (loss) income
    
(26,563
)
    
(54,474
)
    
7,245
      
47,229
      
(26,563
)
Changes in comprehensive (loss) income
    
(17,807
)
    
—
      
38
      
(38
)
    
(17,807
)
Comprehensive (loss) income
   $
(44,370
)
   $
(54,474
)
   $
7,283
     $
47,191
     $
(44,370
)
   
Year Ended December 31, 2017
  
   
Parent
    
Guarantors
    
Non-
Guarantors
    
Eliminations
    
Consolidated
  
                   
Revised
            
Revised
  
   
(in thousands)
  
Revenues
   $
(5,983
)
   $
305,835
     $
277,923
     $
—
     $
577,775
  
Cost of sales
    
1,098
      
(158,135
)
    
(147,690
)
    
—
      
(304,727
)
Depreciation, depletion, and amortization
    
—
      
(58,774
)
    
(61,825
)
    
—
      
(120,599
)
General and administrative
    
(17,693
)
    
(15,690
)
    
(2,228
)
    
—
      
(35,611
)
Exploration and pre-development
    
(459
)
    
(11,600
)
    
(16,899
)
    
—
      
(28,958
)
Research and development    
—
      
(3,276
 )    
—
      
—
      
(3,276
 )
Loss on derivative contracts
    
(21,250
)
    
—
      
—
      
—
      
(21,250
)
Closed operations
    
(24
)
    
—
      
(1
)
    
—
      
(25
)
Equity in earnings of subsidiaries
    
(187,574
)
    
—
      
—
      
187,574
      
—
  
Other (expense) income
    
203,365
      
(29,735
)
    
(42,002
)
    
(202,514
)
    
(70,886
)
Income (loss) before income taxes
    
(28,520
)
    
28,625
      
7,278
      
(14,940
)
    
(7,557
)
(Provision) benefit from income taxes
    
—
      
(208,793
)
    
(14,684
)
    
202,514
      
(20,963
)
Net income (loss)
    
(28,520
)
    
(180,168
)
    
(7,406
)
    
187,574
      
(28,520
)
Preferred stock dividends
    
(552
)
    
—
      
—
      
—
      
(552
)
Income (loss) applicable to common stockholders
    
(29,072
)
    
(180,168
)
    
(7,406
)
    
187,574
      
(29,072
)
Net income (loss)
    
(28,520
)
    
(180,168
)
    
(7,406
)
    
187,574
      
(28,520
)
Changes in comprehensive income (loss)
    
11,229
      
296
      
2,486
      
(2,782
)
    
11,229
  
Comprehensive income (loss)
   $
(17,291
)
   $
(179,872
)
   $
(4,920
)
   $
184,792
     $
(17,291
)
   
Year Ended December 31, 2016
  
   
Parent
    
Guarantors
    
Non-
Guarantors
    
Eliminations
    
Consolidated
  
                   
Revised
            
Revised
  
   
(in thousands)
  
Revenues
   $
(14,237
)
   $
369,162
     $
291,032
     $
—
     $
645,957
  
Cost of sales
    
—
      
(202,475
)
    
(135,850
)
    
—
      
(338,325
)
Depreciation, depletion, and amortization
    
—
      
(65,032
)
    
(58,599
)
    
—
      
(123,631
)
General and administrative
    
(23,262
)
    
(20,425
)
    
(1,353
)
    
—
      
(45,040
)
Exploration and pre-development
    
(304
)
    
(6,640
)
    
(10,913
)
    
—
      
(17,857
)
Gain on derivative contracts
    
4,423
      
—
      
—
      
—
      
4,423
  
Closed operations
    
(2,607
)
    
(34
)
    
(54
)
    
—
      
(2,695
)
Equity in earnings of subsidiaries
    
86,900
      
—
      
—
      
(86,900
)
    
—
  
Other (expense) income
    
10,656
      
11,400
      
(35,885
)
    
(19,344
)
    
(33,173
)
(Loss) income before income taxes
    
61,569
      
85,956
      
48,378
      
(106,244
)
    
89,659
  
(Provision) benefit from income taxes
    
—
      
(25,334
)
    
(22,100
)
    
19,344
      
(28,090
)
Net (loss) income
    
61,569
      
60,622
      
26,278
      
(86,900
)
    
61,569
  
Preferred stock dividends
    
(552
)
    
—
      
—
      
—
      
(552
)
(Loss) income applicable to common stockholders
    
61,017
      
60,622
      
26,278
      
(86,900
)
    
61,017
  
Net (loss) income
    
61,569
      
60,622
      
26,278
      
(86,900
)
    
61,569
  
Changes in comprehensive (loss) income
    
(1,971
)
    
8
      
2,657
      
(2,665
)
    
(1,971
)
Comprehensive (loss) income
   $
59,598
     $
60,630
     $
28,935
     $
(89,565
)
   $
59,598
  
Condensed Cash Flow Statement [Table Text Block]
   
Year Ended December 31, 2018
  
   
Parent
    
Guarantors
    
Non-Guarantors
    
Eliminations
    
Consolidated
  
   
(in thousands)
  
Cash flows from operating activities
   $
(23,136
)
   $
38,116
     $
35,508
     $
43,733
     $
94,221
  
Cash flows from investing activities:
                                        
Additions to properties, plants, and equipment
    
—
      
(90,578
)
    
(46,354
)
    
 
      
(136,932
)
Purchase of other companies, net of cash acquired
    
(139,326
)
    
 
      
—
      
 
      
(139,326
)
Other investing activities, net
    
(186,615
 )    
1,715
      
5,072
      
219,539
 
    
39,711
  
                                         
Cash flows from financing activities:
                                        
Dividends paid to stockholders
    
(4,945
)
    
—
      
—
      
 
      
(4,945
)
Borrowings under debt arrangements
    
102,024
      
—
      
—
      
 
      
102,024
  
Repayments of debt
    
(106,036
)
    
(5,550
)
    
(1,789
)
    
 
      
(113,375
)
Other financing activity
    
260,422
      
33,933
      
(29,671
)
    
(263,272
)
    
1,412
  
Effect of exchange rate changes on cash
    
—
      
—
      
(1,515
)
    
—
      
(1,515
)
Changes in cash, cash equivalents and restricted cash and cash equivalents
    
(97,612
)
    
(22,364
)
    
(38,749
)
    
—
      
(158,725
)
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
   $
6,266
     $
9,684
     $
12,464
     $
—
     $
28,414
  
   
Year Ended December 31, 2017
  
   
Parent
    
Guarantors
    
Non-
Guarantors
    
Eliminations
    
Consolidated
  
   
(in thousands)
  
Cash flows from operating activities
   $
(134,900
)
   $
(98,046
)
   $
120,027
     $
228,797
     $
115,878
  
Cash flows from investing activities:
    
 
      
 
      
 
      
 
      
—
  
Additions to properties, plants, and equipment
    
—
      
(46,570
)
    
(51,468
)
    
 
      
(98,038
)
Other investing activities, net
    
132,118
      
8,119
      
—
      
(138,762
)
    
1,475
  
                                         
Cash flows from financing activities:
                                        
Dividends paid to stockholders
    
(4,528
)
    
—
      
—
      
 
      
(4,528
)
Repayments of debt
    
—
      
(5,242
)
    
(1,744
)
    
 
      
(6,986
)
Other financing activity
    
(2,087
)
    
147,199
      
(48,811
)
    
(90,035
)
    
6,266
  
                                         
Effect of exchange rate changes on cash
    
—
      
—
      
1,095
      
—
      
1,095
  
Changes in cash, cash equivalents and restricted cash and cash equivalents
    
(9,397
)
    
5,460
      
19,099
      
—
      
15,162
  
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
   $
103,878
     $
32,048
     $
51,213
     $
—
     $
187,139
  
   
Year Ended December 31, 2016
  
   
Parent
    
Guarantors
    
Non-
Guarantors
    
Eliminations
    
Consolidated
  
   
(in thousands)
  
Cash flows from operating activities
   $
85,665
     $
82,778
     $
76,491
     $
(19,606
)
   $
225,328
  
Cash flows from investing activities:
    
 
      
 
      
 
      
 
      
—
  
Additions to properties, plants, and equipment
    
(348
)
    
(93,541
)
    
(70,899
)
    
—
      
(164,788
)
Purchase of other companies, net of cash acquired
    
(2,730
)
    
—
      
—
      
—
      
(2,730
)
Other investing activities
    
(30,584
)
    
305
      
333
      
—
      
(29,946
)
                                         
Cash flows from financing activities:
    
 
      
 
      
 
      
—
      
—
  
Dividends paid to stockholders
    
(4,419
)
    
—
      
—
      
 
      
(4,419
)
Repayments of debt
    
—
      
(10,174
)
    
(982
)
    
—
      
(11,156
)
Other financing activity
    
(28,476
)
    
3,529
      
8,895
      
19,606
      
3,554
  
Effect of exchange rates on cash
    
—
      
—
      
(74
)
    
—
      
(74
)
Changes in cash, cash equivalents and restricted cash and cash equivalents
    
19,108
      
(17,103
)
    
13,764
      
—
      
15,769
  
Beginning cash, cash equivalents and restricted cash and cash equivalents
    
94,167
      
43,691
      
18,350
      
—
      
156,208
  
Ending cash, cash equivalents and restricted cash and cash equivalents
   $
113,275
     $
26,588
     $
32,114
     $
—
     $
171,977