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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, 2014 $ 354 $ 1,038,932 $ (748,759) $ 1,722,271 $ 0 $ (429) $ 2,012,369
Balance, Shares at Dec. 31, 2014 35,394   4,367        
Stock-based compensation   59,465         59,465
Stock plan transactions and other $ 4 (211)         (207)
Stock plan transactions and other, Shares 396            
Excess tax benefit on stock-based compensation   74,442         74,442
Acquisition of treasury stock (value)     $ (485,853)       (485,853)
Acquisition of treasury stock (shares)     839        
Net income       475,602     475,602
Other Comprehensive Income (Loss), Net of Income Tax         (1,522) (6,322) (7,844)
Balance at Dec. 31, 2015 $ 358 1,172,628 $ (1,234,612) 2,197,873 (1,522) (6,751) 2,127,974
Balance, Shares at Dec. 31, 2015 35,790   5,206        
Stock-based compensation   65,112         65,112
Stock plan transactions and other $ 0 (185)         (185)
Stock plan transactions and other, Shares 43            
Excess tax benefit on stock-based compensation   1,320         1,320
Acquisition of treasury stock (value)     $ (814,777)       (814,777)
Acquisition of treasury stock (shares)     1,813        
Net income       22,938     22,938
Other Comprehensive Income (Loss), Net of Income Tax         1,402 (1,291) 111
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   66,396         66,396
Stock plan transactions and other $ 1 (181)         (180)
Stock plan transactions and other, Shares 19            
Acquisition of treasury stock (value)     $ (285,020)       (285,020)
Acquisition of treasury stock (shares)     807        
Net income       176,253     176,253
Other Comprehensive Income (Loss), Net of Income Tax         (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