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Note 1 - Business and Significant Accounting Policies (Tables) | 12 Months Ended
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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 |

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