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Condensed Consolidated Statement 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, 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 12,376 $ 0 0 0 0 12,376
Stock-based compensation, Shares 0   0        
Stock plan transactions and other $ 0 (228) $ 0 0 0 0 (228)
Stock plan transactions and other, Shares 31   0        
Acquisition of treasury stock (value) $ 0 0 $ (72,025) 0 0 0 (72,025)
Acquisition of treasury stock (shares) 0   231        
Net income $ 0 0 $ 0 59,446 0 0 59,446
Other comprehensive income (loss), net of income tax 0 0 0 0 (101) 132 31
Balance at Mar. 31, 2018 $ 359 1,317,238 $ (2,406,434) 2,456,510 (407) (3,221) 1,364,045
Balance, Shares at Mar. 31, 2018 35,883   8,057        
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 19,342 $ 0 0 0 0 19,342
Stock-based compensation, Shares 0   0        
Stock plan transactions and other $ 1 (212) $ 0 0 0 0 (211)
Stock plan transactions and other, Shares 135   0        
Acquisition of treasury stock (value) $ 0 0 $ (62,854) 0 0 0 (62,854)
Acquisition of treasury stock (shares) 0   110        
Net income $ 0 0 $ 0 88,132 0 0 88,132
Other comprehensive income (loss), net of income tax 0 0 0 0 100 278 378
Balance at Mar. 31, 2019 $ 361 1,393,284 $ (2,563,410) 2,659,422 (47) (5,811) 1,483,799
Balance, Shares at Mar. 31, 2019 36,108   8,386        
Adoption of ASU No. 2016-02, Leases (Topic 842) $ 0 $ 0 $ 0 $ (2,327) $ 0 $ 0 $ (2,327)