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Note 3 - Adoption of New Revenue Recognition Standard - Impact of ASC 606 Adoption (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Accounts receivable, net $ 25,477   $ 29,930
Prepaid and other current assets 19,474   10,898
Total Current Assets 247,226   223,911
Other assets 11,489   10,955
Total Assets 2,213,786   2,204,632
Current Liabilities:      
Accounts payable and accrued liabilities 98,379   117,855
Deferred revenue 17,780   15,008
Total Current Liabilities 132,097   147,238
Deferred income taxes 212,864   207,154
Other liabilities 11,642   13,111
Total Liabilities 1,513,876   1,528,185
Retained earnings 759,004   728,386
Total Stockholders' Equity 699,910   676,447
Total Liabilities and Stockholders' Equity 2,213,786   2,204,632
Revenues 265,761 $ 207,434  
Selling, general and administrative 50,949 46,385  
Total costs and expenses 201,100 148,858  
Income from operations 64,661 58,576  
Income before income taxes 50,555 51,257  
Income tax provision 9,902 19,144  
Net income $ 40,653 $ 32,113  
Basic (in dollars per share) $ 7.13 $ 5.66  
Diluted (in dollars per share) $ 7.08 $ 5.60  
Comprehensive income $ 40,654 $ 32,115  
Change in deferred income taxes 5,710 (203)  
Deferred revenue 2,772 527  
Other assets and liabilities, net (1,926) (395)  
Net cash provided by operating activities $ 94,692 78,260  
Previously Reported [Member]      
Accounts receivable, net     51,141
Prepaid and other current assets     8,160
Total Current Assets     242,384
Other assets     6,179
Total Assets     2,218,329
Current Liabilities:      
Accounts payable and accrued liabilities     117,963
Deferred revenue     38,266
Total Current Liabilities     170,604
Deferred income taxes     205,636
Other liabilities     9,991
Total Liabilities     1,546,913
Retained earnings     723,354
Total Stockholders' Equity     671,416
Total Liabilities and Stockholders' Equity     2,218,329
Revenues [1]   207,427  
Selling, general and administrative [1]   46,256  
Total costs and expenses [1]   148,729  
Income from operations [1]   58,698  
Income before income taxes [1]   51,379  
Income tax provision [1]   19,190  
Net income [1]   $ 32,189  
Basic (in dollars per share) [1]   $ 5.68  
Diluted (in dollars per share) [1]   $ 5.62  
Comprehensive income [1]   $ 32,191  
Change in deferred income taxes   (157)  
Deferred revenue   425  
Other assets and liabilities, net   (415)  
Net cash provided by operating activities   78,260  
Restatement Adjustment [Member]      
Accounts receivable, net     (21,211)
Prepaid and other current assets     2,738
Total Current Assets     (18,473)
Other assets     4,776
Total Assets     (13,697)
Current Liabilities:      
Accounts payable and accrued liabilities     (108)
Deferred revenue     (23,258)
Total Current Liabilities     (23,366)
Deferred income taxes     1,518
Other liabilities     3,120
Total Liabilities     (18,728)
Retained earnings     5,032
Total Stockholders' Equity     5,031
Total Liabilities and Stockholders' Equity     $ (13,697)
Revenues   7  
Selling, general and administrative   129  
Total costs and expenses   129  
Income from operations   (122)  
Income before income taxes   (122)  
Income tax provision   (46)  
Net income   $ (76)  
Basic (in dollars per share)   $ (0.02)  
Diluted (in dollars per share)   $ (0.02)  
Comprehensive income   $ (76)  
Change in deferred income taxes   (46)  
Deferred revenue   102  
Other assets and liabilities, net   20  
Net cash provided by operating activities    
[1] Refer to note 2 for details regarding this revision.