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Note 11 - Shareholders' Equity - Schedule of Shareholders' Equity (Details) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Balance as of December 31, 2018 $ 1,066,928 $ 1,040,373
Stock options exercised and stock awards 1,231 766
Stock-based compensation related to stock options, restricted shares and employee stock purchase plan 8,836 7,893
Vesting of restricted share awards (2,315) (1,619)
Issuance of common stock under employee stock purchase plan 1,681 1,354
Common stock repurchases (26,048) (38,137)
Foreign currency translation adjustment 384  
Net income 37,104 21,039
Balance at March 31, 2019 1,083,421 1,031,669
Common Class A [Member]    
Dividend (3,389)  
Common Class B [Member]    
Dividend (991)  
Common Stock [Member]    
Balance as of December 31, 2018 458 454
Stock options exercised and stock awards 1
Vesting of restricted share awards 2 2
Issuance of common stock under employee stock purchase plan 1 1
Foreign currency translation adjustment  
Balance at March 31, 2019 $ 462 $ 457
Common Stock [Member] | Common Class A [Member]    
Balance (in shares) 28,710 31,345
Stock options exercised and stock awards (in shares) 59 30
Vesting of restricted share awards (in shares) 1
Issuance of common stock under employee stock purchase plan (in shares) 57 41
Common stock repurchases (in shares) (639) (834)
Balance (in shares) 28,187 30,583
Common Stock [Member] | Common Class B [Member]    
Balance (in shares) 8,290 8,469
Stock options exercised and stock awards (in shares)
Vesting of restricted share awards (in shares) 226 226
Issuance of common stock under employee stock purchase plan (in shares)
Common stock repurchases (in shares) (53) (72)
Balance (in shares) 8,463 8,623
Additional Paid-in Capital [Member]    
Balance as of December 31, 2018 $ 370,025 $ 348,044
Stock options exercised and stock awards 1,230 766
Stock-based compensation related to stock options, restricted shares and employee stock purchase plan 8,836 7,893
Vesting of restricted share awards (2,317) (1,621)
Issuance of common stock under employee stock purchase plan 1,680 1,353
Foreign currency translation adjustment  
Balance at March 31, 2019 379,454 356,435
Treasury Stock [Member]    
Balance as of December 31, 2018 (245,842) (120,682)
Common stock repurchases (26,048) (38,137)
Foreign currency translation adjustment  
Balance at March 31, 2019 (271,890) (158,819)
Retained Earnings [Member]    
Balance as of December 31, 2018 942,287 812,557
Foreign currency translation adjustment  
Net income 37,104 21,039
Balance at March 31, 2019 975,011 $ 833,596
Retained Earnings [Member] | Common Class A [Member]    
Dividend (3,389)  
Retained Earnings [Member] | Common Class B [Member]    
Dividend (991)  
AOCI Attributable to Parent [Member]    
Balance as of December 31, 2018  
Stock options exercised and stock awards  
Stock-based compensation related to stock options, restricted shares and employee stock purchase plan  
Vesting of restricted share awards  
Issuance of common stock under employee stock purchase plan  
Common stock repurchases  
Dividend  
Foreign currency translation adjustment 384  
Net income  
Balance at March 31, 2019 $ 384