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Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-In Capital | Retained Earnings | Treasury Stock | Deferred Compensation Trust | Deferred Compensation Liability
--- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2014 | $ 1,124,255 | $ 206 | $ 1,325,495 | $ 4,887,187 | $ (5,088,633) | $ (17,333) | $ 17,333
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 382,927 |  |  | 382,927 |  |  |
Purchase of common stock for treasury | (431,367) |  |  |  | (431,367) |  |
Equity-based compensation | 54,091 |  | 54,091 |  |  |  |
Tax benefit from equity benefit plan activity | 23,311 |  | 23,311 |  |  |  |
Proceeds from stock options exercised | 85,948 |  | 85,948 |  |  |  |
Treasury stock issued upon option exercise and restricted share vesting |  |  | (41,050) |  | 41,050 |  |
Ending Balance at Dec. 31, 2015 | 1,239,165 | 206 | 1,447,795 | 5,270,114 | (5,478,950) | (17,333) | 17,333
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 425,262 |  |  | 425,262 |  |  |
Deferred compensation activity |  |  |  |  |  | (42) | 42
Purchase of common stock for treasury | (455,351) |  |  |  | (455,351) |  |
Equity-based compensation | 43,598 |  | 43,598 |  |  |  |
Tax benefit from equity benefit plan activity | 13,661 |  | 13,661 |  |  |  |
Proceeds from stock options exercised | 38,106 |  | 38,106 |  |  |  |
Treasury stock issued upon option exercise and restricted share vesting |  |  | (27,332) |  | 27,332 |  |
Ending Balance at Dec. 31, 2016 | 1,304,441 | 206 | 1,515,828 | 5,695,376 | (5,906,969) | (17,375) | 17,375
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Cumulative-effect adjustment from adoption of ASU 2016-09, net of tax | 609 |  | 1,566 | (957) |  |  |
Net income | 537,521 |  |  | 537,521 |  |  |
Deferred compensation activity |  |  |  |  |  | (8) | 8
Purchase of common stock for treasury | (422,166) |  |  |  | (422,166) |  |
Equity-based compensation | 44,562 |  | 44,562 |  |  |  |
Tax benefit from equity benefit plan activity | 0 |  |  |  |  |  |
Proceeds from stock options exercised | 140,525 |  | 140,525 |  |  |  |
Treasury stock issued upon option exercise and restricted share vesting |  |  | (58,284) |  | 58,284 |  |
Ending Balance at Dec. 31, 2017 | $ 1,605,492 | $ 206 | $ 1,644,197 | $ 6,231,940 | $ (6,270,851) | $ (17,383) | $ 17,383

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