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Consolidated Statements of Stockholders' Equity (Deficit) - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Deferred Stock Units | Retained Earnings | Accumulated Other Comprehensive Loss | Treasury Stock | Noncontrolling Interest
--- | --- | --- | --- | --- | --- | --- | --- | ---
Balance (in shares) at Dec. 31, 2015 |  | 102,237 |  |  |  |  |  |
Balance beginning of period at Dec. 31, 2015 | $ (83,995) | $ 10,258 | $ 940,534 | $ 5,409 | $ 318,356 | $ (42,265) | $ (1,316,417) | $ 130
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income | 222,054 |  |  |  | 222,045 |  |  | 9
Other comprehensive income (loss), net | (788) |  |  |  |  | (788) |  |
Repurchases of common stock, net | (317,026) |  |  |  |  |  | (317,026) |
Common stock issued under stock plans, including excess tax benefit (in shares) |  | 1,104 |  |  |  |  |  |
Common stock issued under stock plans, including excess tax benefit | 51,980 | $ 76 | 51,904 |  |  |  |  |
Deferred stock units activity | (329) |  | (343) | 14 |  |  |  |
Share-based compensation cost | 19,891 |  | 19,800 | 91 |  |  |  |
Balance (in shares) at Dec. 31, 2016 |  | 103,341 |  |  |  |  |  |
Balance end of period at Dec. 31, 2016 | (108,213) | $ 10,334 | 1,011,895 | 5,514 | 540,401 | (43,053) | (1,633,443) | 139
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income | 263,269 |  |  |  | 263,144 |  |  | 125
Other comprehensive income (loss), net | 6,583 |  |  |  |  | 6,583 |  |
Repurchases of common stock, net | (278,085) |  |  |  |  |  | (278,085) |
Common stock issued under stock plans, including excess tax benefit (in shares) |  | 934 |  |  |  |  |  |
Common stock issued under stock plans, including excess tax benefit | 39,099 | $ 94 | 39,005 |  |  |  |  |
Deferred stock units activity | (12) |  | (350) | 338 |  |  |  |
Share-based compensation cost | $ 23,517 |  | 23,381 | 136 |  |  |  |
Balance (in shares) at Dec. 31, 2017 | 104,275 | 104,275 |  |  |  |  |  |
Balance end of period at Dec. 31, 2017 | $ (53,842) | $ 10,428 | 1,073,931 | 5,988 | 803,545 | (36,470) | (1,911,528) | 264
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Cumulative effect of accounting changes (Note 2) | (12,648) |  |  |  | (12,648) |  |  |
Net income | 377,047 |  |  |  | 377,031 |  |  | 16
Other comprehensive income (loss), net | (5,321) |  |  |  |  | (5,321) |  |
Repurchases of common stock, net | (377,371) |  |  |  |  |  | (377,371) |
Common stock issued under stock plans, including excess tax benefit (in shares) |  | 812 |  |  |  |  |  |
Common stock issued under stock plans, including excess tax benefit | 37,745 | $ 81 | 39,756 | (2,092) |  |  |  |
Deferred stock units activity | 0 |  | (385) | 385 |  |  |  |
Share-based compensation cost | $ 25,157 |  | 24,914 | 243 |  |  |  |
Balance (in shares) at Dec. 31, 2018 | 105,087 | 105,087 |  |  |  |  |  |
Balance end of period at Dec. 31, 2018 | $ (9,233) | $ 10,509 | $ 1,138,216 | $ 4,524 | $ 1,167,928 | $ (41,791) | $ (2,288,899) | $ 280

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- Definition Net deferred stock units which were issued, vested and settled during the period. Deferred stock units issued to employees will generally settle and convert to common stock not earlier than one year following their termination of employment or resignation. With respect to non-employee directors, deferred stock units issued prior to January 1, 2011 will generally settle and convert to common stock not earlier than one year from the date the recipients retire from the board. Deferred stock units issued to non-employee directors on or after January 1, 2011 will generally settle and convert to common stock: (i) not earlier than one year from the date the recipients retire from the board; or (ii) in a lump sum on another single non-discriminatory and objectively determinable date or in four equal annual installments commencing on that date. The shares of common stock associated with these deferred stock units are issuable for no cash consideration, the number of shares of common stock to be issued is fixed and issuance is not contingent. + References No definition available. + Details
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