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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Accumulated Other Comprehensive Income (Loss) | Retained Earnings
--- | --- | --- | --- | --- | ---
Balance, at Dec. 31, 2012 | $ 1,778,355 |  | $ 23,488 | $ 1,347,762 | $ 5,820 | $ 401,285
Balance, Shares at Dec. 31, 2012 |  |  | 187,908 |  |  |
Issuance of stock to employees under benefit plans, net of shares withheld for payroll tax (in shares) |  |  | 3,823 |  |  |
Issuance of stock to employees under benefit plans, net of shares withheld for payroll tax | 5,404 |  | $ 478 | 4,926 |  |
Stock-based compensation expense | 35,612 |  |  | 35,612 |  |
Tax benefit related to stock options and restricted stock units | 2,596 |  |  | 2,596 |  |
Net income | 164,947 |  |  |  |  | 164,947
Unrealized gains (losses) on marketable securities: |  |  |  |  |  |
Unrealized (losses) gains on marketable securities arising during period, net of tax of $(1,667), $1,449, $(216), respectively | (1,097) |  |  |  | (1,097) |
Less: Reclassification adjustment for gains included in net income, net of tax of $(390), $(645), $(257), respectively | (447) |  |  |  | (447) |
Amortization of prior service (credit) cost included in net periodic pension and post-retirement expense/income, net of tax $(169), $(169), $(159), respectively | (276) | [1] |  |  | (276) |
Balance, at Dec. 31, 2013 | 1,985,094 |  | $ 23,966 | 1,390,896 | 4,000 | 566,232
Balance, Shares at Dec. 31, 2013 |  |  | 191,731 |  |  |
Issuance of stock to employees under benefit plans, net of shares withheld for payroll tax (in shares) |  |  | 3,661 |  |  |
Issuance of stock to employees under benefit plans, net of shares withheld for payroll tax | 9,273 |  | $ 458 | 8,815 |  |
Warrant settlement |  |  | $ 2,653 | (2,653) |  |
Warrant settlement Shares |  |  | 21,221 |  |  |
Stock-based compensation expense | 39,868 |  |  | 39,868 |  |
Tax benefit related to stock options and restricted stock units | 209 |  |  | 209 |  |
Cash dividends | (37,425) |  |  |  |  | (37,425)
Net income | 81,272 |  |  |  |  | 81,272
Unrealized gains (losses) on marketable securities: |  |  |  |  |  |
Unrealized (losses) gains on marketable securities arising during period, net of tax of $(1,667), $1,449, $(216), respectively | 2,417 |  |  |  | 2,417 |
Less: Reclassification adjustment for gains included in net income, net of tax of $(390), $(645), $(257), respectively | (1,433) |  |  |  | (1,433) |
Amortization of prior service (credit) cost included in net periodic pension and post-retirement expense/income, net of tax $(169), $(169), $(159), respectively | (295) | [1] |  |  | (295) |
Balance, at Dec. 31, 2014 | 2,078,980 |  | $ 27,077 | 1,437,135 | 4,689 | 610,079
Balance, Shares at Dec. 31, 2014 |  |  | 216,613 |  |  |
Issuance of stock to employees under benefit plans, net of shares withheld for payroll tax (in shares) |  |  | 2,649 |  |  |
Issuance of stock to employees under benefit plans, net of shares withheld for payroll tax | 8,933 |  | $ 331 | 8,602 |  |
Stock-based compensation expense | 30,285 |  |  | 30,285 |  |
Repurchase of common stock | $ (299,949) |  | $ (1,953) |  |  | (297,996)
Repurchase of common stock (in shares) | (15,621) |  | (15,621) |  |  |
Tax benefit related to stock options and restricted stock units | $ 4,625 |  |  | 4,625 |  |
Cash dividends | (50,732) |  |  |  |  | (50,732)
Net income | 206,477 |  |  |  |  | 206,477
Foreign currency translation adjustment | (8,759) |  |  |  | (8,759) |
Unrealized gains (losses) on marketable securities: |  |  |  |  |  |
Unrealized (losses) gains on marketable securities arising during period, net of tax of $(1,667), $1,449, $(216), respectively | (3,075) |  |  |  | (3,075) |
Less: Reclassification adjustment for gains included in net income, net of tax of $(390), $(645), $(257), respectively | (704) |  |  |  | (704) |
Amortization of prior service (credit) cost included in net periodic pension and post-retirement expense/income, net of tax $(169), $(169), $(159), respectively | (295) | [1] |  |  | (295) |
Balance, at Dec. 31, 2015 | $ 1,965,786 |  | $ 25,455 | $ 1,480,647 | $ (8,144) | $ 467,828
Balance, Shares at Dec. 31, 2015 |  |  | 203,641 |  |  |
[1] | The amortization of prior service benefit is included in the computation of net periodic pension cost and postretirement benefit; see Note M: "Retirement Plans."

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