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Note 1 - Business and Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Error Corrections and Prior Period Adjustments [Table Text Block]
   
December 31, 2017
    
December 31, 2016
  
   
As
originally
reported
    
Adjustments
    
As
Restated
    
As
originally
reported
    
Adjustments
    
As
Revised
  
Deferred income tax assets
    
20,135
      
37,202
      
57,337
      
-
      
-
      
-
  
Total assets
    
2,586,662
      
37,202
      
2,623,864
      
2,461,569
      
-
      
2,461,569
  
Deferred income tax liabilities
    
-
      
61,961
      
61,961
      
35,382
      
1,029
      
36,411
  
Liability for unrecognized tax benefits
    
8,890
      
-
      
8,890
      
5,738
      
706
      
6,444
  
Total liabilities
    
1,259,787
      
61,961
      
1,321,748
      
1,286,790
      
1,735
      
1,288,525
  
Retained earnings
    
351,622
      
(24,367
 )    
327,255
      
216,644
      
(1,292
 )    
215,352
  
Accumulated other comprehensive loss
    
(4,314
 )    
(392
 )    
(4,706
 )    
(7,732
 )    
(443
 )    
(8,175
 )
Total stockholders’ equity attributable to the Company’s stockholders
    
1,236,137
      
(24,759
 )    
1,211,378
      
1,078,425
      
(1,735
 )    
1,076,690
  
Total equity
    
1,320,459
      
(24,759
 )    
1,295,700
      
1,170,007
      
(1,735
 )    
1,168,272
  
   
Year ended December 31, 2017
    
Year ended December 31, 2016
    
Year ended December 31, 2015
  
   
As
originally
reported
    
Adjustments
    
As
Restated
    
As
originally
reported
    
Adjustments
    
As
Revised
    
As
originally
reported
    
Adjustments
    
As
Revised
  
Income tax (provision) benefit
   $
1,411
     $
(23,075
 )   $
(21,664
 )   $
(31,837
 )   $
(5,222
 )   $
(37,059
 )   $
15,258
     $
799
     $
16,057
  
Income from continuing operations
    
170,184
      
(23,075
 )    
147,109
      
101,516
      
(5,222
 )    
96,294
      
123,349
      
799
      
124,148
  
Net income attributable to the Company’s Stockholders
    
155,489
      
(23,075
 )    
132,414
      
93,930
      
(5,222
 )    
88,708
      
119,573
      
799
      
120,372
  
Loss in respect of derivative instruments designated for cash flow hedge
    
84
      
51
      
135
      
87
      
54
      
141
      
91
      
56
      
147
  
Comprehensive income
    
174,439
      
(23,024
 )    
151,415
      
101,044
      
(5,168
 )    
95,876
      
124,350
      
855
      
125,205
  
Comprehensive income attributable to the Company’s stockholders
    
158,907
      
(23,024
 )    
135,883
      
93,865
      
(5,168
 )    
88,697
      
120,574
      
855
      
121,429
  
Earnings per share
                                                                        
Basic:
    
3.10
      
(0.46
 )    
2.64
      
1.90
      
(0.11
 )    
1.79
      
2.46
      
0.02
      
2.48
  
Diluted:
    
3.06
      
(0.45
 )    
2.61
      
1.87
      
(0.10
 )    
1.77
      
2.43
      
0.02
      
2.45
  
   
As
originally
reported
    
Adjustments
    
As
Revised
  
                         
Balance as of December 31, 2014:
  
 
 
 
  
 
 
 
  
 
 
 
Retained earnings
   $
41,539
     $
3,131
     $
44,670
  
Accumulated other comprehensive loss
    
(8,668
 )    
(553
 )    
(9,221
 )
Total stockholders’ equity attributable to the Company’s stockholders
    
774,923
      
2,578
      
777,501
  
Total equity
    
786,746
      
2,578
      
789,324
  
Net income for the year ended December 31, 2015
    
123,349
      
799
      
124,148
  
Net income attributable to the Company’s stockholders for the year ended December 31, 2015
    
119,573
      
799
      
120,372
  
Loss in respect of derivative instruments designated for cash flow hedge for the year ended December 31, 2015
    
91
      
56
      
147
  
Balance as of December 31, 2015:
  
 
 
 
  
 
 
 
  
 
 
 
Retained earnings
    
148,396
      
3,930
      
152,326
  
Accumulated other comprehensive loss
    
(7,667
 )    
(497
 )    
(8,164
 )
Total stockholders’ equity attributable to the Company’s stockholders
    
990,001
      
3,433
      
993,434
  
Total equity
    
1,083,874
      
3,433
      
1,087,307
  
Net income for the year ended December 31, 2016
    
101,232
      
(5,222
 )    
96,010
  
Net income attributable to the Company’s stockholders for the year ended December 31, 2016
    
93,930
      
(5,222
 )    
88,708
  
Loss in respect of derivative instruments designated for cash flow hedge for the year ended December 31, 2016
    
87
      
54
      
141
  
Balance as of December 31, 2016:
  
 
 
 
  
 
 
 
  
 
 
 
Retained earnings
    
216,644
      
(1,292
 )    
215,352
  
Accumulated other comprehensive loss
    
(7,732
 )    
(443
 )    
(8,175
 )
Total stockholders’ equity attributable to the Company's stockholders
    
1,078,425
      
(1,735
 )    
1,076,690
  
Total equity
    
1,170,007
      
(1,735
 )    
1,168,272
  
   
As
originally
reported
    
Adjustments
    
As
Restated
  
Net income for the year ended December 31, 2017
   $
169,132
     $
(23,075
 )   $
146,057
  
Net income attributable to the Company’s stockholders for the year ended December 31, 2017
    
155,489
      
(23,075
 )    
132,414
  
Loss in respect of derivative instruments designated for cash flow hedge for the year ended December 31, 2017
    
84
      
51
      
135
  
Balance as of December 31, 2017:
  
 
 
 
  
 
 
 
  
 
 
 
Retained earnings
    
351,622
      
(24,367
 )    
327,255
  
Accumulated other comprehensive loss
    
(4,314
 )    
(392
 )    
(4,706
 )
Total stockholders’ equity attributable to the Company’s stockholders
    
1,236,137
      
(24,759
 )    
1,211,378
  
Total equity
    
1,320,459
      
(24,759
 )    
1,295,700
  
   
Year ended December 31, 2017
    
Year ended December 31, 2016
    
Year ended December 31, 2015
  
   
As
originnally reported
    
Adjustments
    
As
Restated
    
As
originally reported
    
Adjustments
    
As
Revised
    
As
originally reported
    
Adjustments
    
As
Revised
  
Net income
   $
170,184
     $
(23,075
 )   $
147,109
     $
101,516
     $
(5,222
 )   $
96,294
     $
123,349
     $
799
     $
124,148
  
Deferred income tax provision
    
(64,104
 )    
22,957
      
(41,147
 )    
18,473
      
4,749
      
23,222
      
(39,530
 )    
(432
 )    
(39,962
 )
Liability for unrecognized tax benefits
    
3,152
      
118
      
3,270
      
(4,647
 )    
473
      
(4,174
 )    
2,874
      
233
      
3,107
  
Accounts payable and accrued expenses
    
51,641
      
-
      
51,641
      
(1,375
 )    
-
      
(1,375
 )    
(339
 )    
(600
 )    
(939
 )
Net cash provided by operating activities    
245,575
      
-
      
245,575
      
159,285
      
-
      
159,285
      
190,025
      
-
      
190,025
  
Schedule Of Estimated Useful Lives [Table Text Block]
Buildings (in years)
  
 
25
 
  
Leasehold improvements (in years)
  
 15
-
20
  
Machinery and equipment
— manufacturing and drilling (in years)
  
 
10
 
  
Machinery and equipment
— computers (in years)
  
 3
-
5
  
Office equipment
— furniture and fixtures (in years)
  
 5
-
15
  
Office equipment
— other (in years)
  
 5
-
10
  
Automobiles (in years)
  
 5
-
7
  
Schedule of Weighted Average Number of Shares [Table Text Block]
   
Year Ended December 31,
  
   
2017
   
2016
   
2015
 
   
(In thousands)
  
Weighted average number of shares used in computation of basic earnings per share
    
50,110
      
49,469
      
48,562
  
Add:
                        
Additional shares from the assumed exercise of employee stock options
    
659
      
671
      
625
  
                         
Weighted average number of shares used in computation of diluted earnings per share
    
50,769
      
50,140
      
49,187