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Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands | Total | Common Stock [Member] | Additional Paid-In-Capital [Member] | Retained Earnings [Member] | Treasury Stock [Member] | Deferred Compensation Trust [Member] | Deferred Compensation Liability [Member]
--- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2013 | $ 1,261,352 | $ 206 | $ 1,212,050 | $ 4,605,557 | $ (4,556,461) | $ (17,741) | $ 17,741
Net income | 281,630 |  |  | 281,630 |  |  |
Deferred compensation activity |  |  |  |  |  | 408 | (408)
Purchase of common stock for treasury | (567,544) |  |  |  | (567,544) |  |
Equity-based compensation | 63,227 |  | 63,227 |  |  |  |
Tax benefit from equity benefit plan activity | 9,437 |  | 9,437 |  |  |  |
Proceeds from stock options exercised | 76,153 |  | 76,153 |  |  |  |
Treasury stock issued upon option exercise and restricted share vesting |  |  | (35,372) |  | 35,372 |  |
Ending Balance at Dec. 31, 2014 | 1,124,255 | 206 | 1,325,495 | 4,887,187 | (5,088,633) | (17,333) | 17,333
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
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

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