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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 |  |  |  |

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