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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
--- | --- | --- | --- | --- | ---
Balance (in shares) at Dec. 31, 2013 |  | 53,926,525 |  |  |
Balance at Dec. 31, 2013 | $ 640,133 | $ 539 | $ 493,279 | $ 146,199 | $ 116
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Exercise of common stock options (in shares) |  | 147,163 |  |  |
Exercise of common stock options | 1,105 | $ 1 | 1,104 |  |
Employee stock purchase plan (in shares) |  | 207,805 |  |  |
Employee stock purchase plan | 5,253 | $ 2 | 5,251 |  |
Stock Repurchased and Retired During Period, Shares |  | (3,359,604) |  |  |
Stock Repurchased and Retired During Period, Value | (100,048) | $ (33) | (31,194) | (68,821) |
Stock-based compensation expense | 17,246 |  |  |  |
Vesting of restricted stock units and restricted stock awards (in shares) |  | 464,804 |  |  |
Vesting of restricted stock units and restricted stock awards | (6,497) | $ 5 | (6,502) |  |
Tax deficiency from stock-based compensation | 4,718 |  | 4,718 |  |
Fair value adjustment of derivatives, net of income tax | 86 |  |  |  | 86
Translation adjustments | (4,772) |  |  |  | (4,772)
Net income (loss) | 77,184 |  |  | 77,184 |
Balance (in shares) at Dec. 31, 2014 |  | 51,386,693 |  |  |
Balance at Dec. 31, 2014 | 634,408 | $ 514 | 483,902 | 154,562 | (4,570)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Exercise of common stock options (in shares) |  | 329,502 |  |  |
Exercise of common stock options | 3,472 | $ 3 | 3,469 |  |
Employee stock purchase plan (in shares) |  | 204,401 |  |  |
Employee stock purchase plan | $ 5,293 | $ 2 | 5,291 |  |
Stock Repurchased and Retired During Period, Shares | 0 | (89,174) |  |  |
Stock Repurchased and Retired During Period, Value | $ (3,819) | $ (1) | (1,173) | (2,645) |
Stock-based compensation expense | 23,471 |  |  |  |
Vesting of restricted stock units and restricted stock awards (in shares) |  | 398,850 |  |  |
Vesting of restricted stock units and restricted stock awards | (8,823) | $ 4 | (8,827) |  |
Tax deficiency from stock-based compensation | $ 6,551 |  | 6,551 |  |
Stock Issued During Period, Shares, Acquisitions | 794,700 | 794,700 |  |  |
Stock Issued During Period, Value, Acquisitions | $ 30,183 | $ 8 | 30,175 |  |
Fair value adjustment of derivatives, net of income tax | 122 |  |  |  | 122
Translation adjustments | (3,714) |  |  |  | (3,714)
Net income (loss) | $ 97,650 |  |  | 97,650 |
Balance (in shares) at Dec. 31, 2015 | 53,024,972 | 53,024,972 |  |  |
Balance at Dec. 31, 2015 | $ 784,794 | $ 530 | 542,859 | 249,567 | (8,162)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Exercise of common stock options (in shares) |  | 185,484 |  |  |
Exercise of common stock options | 2,251 | $ 2 | 2,249 |  |
Employee stock purchase plan (in shares) |  | 242,303 |  |  |
Employee stock purchase plan | $ 7,507 | $ 2 | 7,505 |  |
Stock Repurchased and Retired During Period, Shares | (1,133,553) | (1,133,553) |  |  |
Stock Repurchased and Retired During Period, Value | $ (43,091) | $ (11) | (11,885) | (31,195) |
Stock-based compensation expense | 26,559 |  |  |  |
Vesting of restricted stock units and restricted stock awards (in shares) |  | 397,182 |  |  |
Vesting of restricted stock units and restricted stock awards | (7,160) | $ 4 | (7,164) |  |
Tax deficiency from stock-based compensation | 2,739 |  | 2,739 |  |
Fair value adjustment of derivatives, net of income tax | 0 |  |  |  |
Translation adjustments | (1,861) |  |  |  | (1,861)
Net income (loss) | $ 97,201 |  |  | 97,201 |
Balance (in shares) at Dec. 31, 2016 | 52,716,388 | 52,716,388 |  |  |
Balance at Dec. 31, 2016 | $ 868,939 | $ 527 | $ 562,862 | $ 315,573 | $ (10,023)

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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(31)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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