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Consolidated Statements Of Shareholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Common Stock [Member]
Additional Paid-In Capital [Member]
Treasury Stock [Member]
Retained Earnings [Member]
Available-for-sale-securities [Member]
Foreign Currency Translation [Member]
Total
Balance at Dec. 31, 2016 $ 358 $ 1,238,875 $ (2,049,389) $ 2,220,811 $ (120) $ (8,042) $ 1,402,493
Balance, Shares at Dec. 31, 2016 35,833   7,019        
Stock-based compensation $ 0 66,396 $ 0 0 0 0 66,396
Stock-based compensation, Shares 0   0        
Stock plan transactions and other $ 1 (181) $ 0 0 0 0 (180)
Stock plan transactions and other, Shares 19   0        
Acquisition of treasury stock (value) $ 0 0 $ (285,020) 0 0 0 (285,020)
Acquisition of treasury stock (shares) 0   807        
Net income $ 0 0 $ 0 176,253 0 0 176,253
Other comprehensive income (loss), net of income taxes 0 0 0 0 (186) 4,689 4,503
Balance at Dec. 31, 2017 $ 359 1,305,090 $ (2,334,409) 2,397,064 (306) (3,353) 1,364,445
Balance, Shares at Dec. 31, 2017 35,852   7,826        
Stock-based compensation $ 0 69,947 $ 0 0 0 0 69,947
Stock-based compensation, Shares 0   0        
Stock plan transactions and other $ 1 (883) $ 0 0 0 0 (882)
Stock plan transactions and other, Shares 121   0        
Acquisition of treasury stock (value) $ 0 0 $ (166,147) 0 0 0 (166,147)
Acquisition of treasury stock (shares) 0   450        
Net income $ 0 0 $ 0 176,553 0 0 176,553
Other comprehensive income (loss), net of income taxes 0 0 0 0 159 (2,736) (2,577)
Balance at Dec. 31, 2018 $ 360 1,374,154 $ (2,500,556) 2,573,617 (147) (6,089) 1,441,339
Balance, Shares at Dec. 31, 2018 35,973   8,276        
Stock-based compensation $ 0 92,062 $ 0 0 0 0 92,062
Stock-based compensation, Shares 0   0        
Stock plan transactions and other $ 3 (519) $ 0 0 0 0 (516)
Stock plan transactions and other, Shares 350   0        
Acquisition of treasury stock (value) $ 0 0 $ (198,563) 0 0 0 (198,563)
Acquisition of treasury stock (shares) 0   292        
Net income $ 0 0 $ 0 350,158 0 0 350,158
Other comprehensive income (loss), net of income taxes 0 0 0 0 147 726 873
Balance at Dec. 31, 2019 $ 363 1,465,697 $ (2,699,119) 2,921,448 0 (5,363) 1,683,026
Balance, Shares at Dec. 31, 2019 36,323   8,568        
Adoption of ASU No. 2016-02, Leases (Topic 842) $ 0 $ 0 $ 0 $ (2,327) $ 0 $ 0 $ (2,327)