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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified | Total | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
--- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2009 | $ 226,661 | $ 363 | $ 220,082 | $ 5,090 | $ 1,126
Balance (in shares) at Dec. 31, 2009 |  | 36,262,810 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Exercise of common stock options (in shares) |  | 68,200 |  |  |
Exercise of common stock options | 333 | 1 | 332 |  |
Stock repurchase and retirement (in shares) |  | (291,212) |  |  |
Stock repurchase and retirement | (2,000) | (3) | (1,783) | (214) |
Stock-based compensation expense | 7,151 |  | 7,151 |  |
Vesting of restricted stock units and restricted stock awards (in shares) |  | 359,013 |  |  |
Vesting of restricted stock units and restricted stock awards | (1,305) | 4 | (1,309) |  |
Tax deficiency from stock-based compensation | (334) |  | (334) |  |
Fair value adjustment of derivatives, net of income tax | 0 |  |  |  |
Translation adjustments | (1,122) |  |  |  | (1,122)
Net income (loss) | (9,897) |  |  | (9,897) |
Balance at Dec. 31, 2010 | 219,487 | 365 | 224,139 | (5,021) | 4
Balance (in shares) at Dec. 31, 2010 |  | 36,398,811 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Exercise of common stock options (in shares) |  | 293,893 |  |  |
Exercise of common stock options | 1,724 | 2 | 1,722 |  |
Employee stock purchase plan (in shares) |  | 187,036 |  |  |
Employee stock purchase plan | 977 | 2 | 975 |  |
Stock repurchase and retirement (in shares) |  | (323,361) |  |  |
Stock repurchase and retirement | (2,230) | (3) | (1,985) | (242) |
Stock-based compensation expense | 5,868 |  | 5,868 |  |
Vesting of restricted stock units and restricted stock awards (in shares) |  | 455,871 |  |  |
Vesting of restricted stock units and restricted stock awards | (2,219) | 4 | (2,223) |  |
Tax deficiency from stock-based compensation | 881 |  | 881 |  |
Fair value adjustment of derivatives, net of income tax | (380) |  |  |  | (380)
Translation adjustments | (1,662) |  |  |  | (1,662)
Net income (loss) | 24,297 |  |  | 24,297 |
Balance at Dec. 31, 2011 | 246,743 | 370 | 229,377 | 19,034 | (2,038)
Balance (in shares) at Dec. 31, 2011 | 37,012,250 | 37,012,250 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Exercise of common stock options (in shares) |  | 968,206 |  |  |
Exercise of common stock options | 7,041 | 10 | 7,031 |  |
Employee stock purchase plan (in shares) |  | 154,934 |  |  |
Employee stock purchase plan | 1,344 | 2 | 1,342 |  |
Stock-based compensation expense | 9,558 |  | 9,558 |  |
Vesting of restricted stock units and restricted stock awards (in shares) |  | 520,652 |  |  |
Vesting of restricted stock units and restricted stock awards | (5,535) | 5 | (5,540) |  |
Tax deficiency from stock-based compensation | 4,528 |  | 4,528 |  |
Acquisition of Apex (in shares) |  | 14,304,528 |  |  |
Acquisition of Apex | 225,558 | 143 | 225,415 |  |
Fair value adjustment of derivatives, net of income tax | (21) |  |  |  | (21)
Translation adjustments | 854 |  |  |  | 854
Net income (loss) | 42,653 |  |  | 42,653 |
Balance at Dec. 31, 2012 | $ 532,723 | $ 530 | $ 471,711 | $ 61,687 | $ (1,205)
Balance (in shares) at Dec. 31, 2012 | 52,960,570 | 52,960,570 |  |  |

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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + 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 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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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 210.5-02.29-31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A3 -Appendix A Reference 4: 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=6228006&loc=d3e74512-122707 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section E + Details
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