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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified | Total | Common Stock | Retained Earnings | Accumulated Other Comprehensive Income (Loss)
--- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2010 | $ 235,615 | $ 67,091 | $ 167,664 | $ 860
Beginning balance, shares at Dec. 31, 2010 |  | 35,496,000 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income | 23,044 |  | 23,044 |
Other comprehensive loss, net of tax | (710) |  |  | (710)
Excess tax benefits from stock-based compensation | 3,122 | 3,122 |  |
Stock-based compensation expense | 1,644 | 1,644 |  |
Issuance of common stock, net of offering costs | 87,700 | 87,700 |  |
Issuance of common stock, net of offering costs, shares |  | 5,520,000 |  |
Issuance of common stock under Employee Stock Purchase Plans | 430 | 430 |  |
Issuance of common stock under Employee Stock Purchase Plans, shares |  | 31,000 |  |
Options exercised | 8,449 | 8,449 |  |
Options exercised, shares |  | 1,099,000 |  |
Shares surrendered in exchange for payment of payroll tax liabilities | 953 | 953 |  |
Shares surrendered in exchange for payment of payroll tax liabilities, shares |  | (60,000) |  |
Shares surrendered in exchange for the exercise of stock options | (1,252) | (1,252) |  |
Shares surrendered in exchange for the exercise of stock options, shares | (78,000) | (78,000) |  |
Ending balance at Dec. 31, 2011 | 357,089 | 166,231 | 190,708 | 150
Ending balance, shares at Dec. 31, 2011 |  | 42,008,000 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income | 19,710 |  | 19,710 |
Other comprehensive loss, net of tax | (1,332) |  |  | (1,332)
Excess tax benefits from stock-based compensation | 877 | 877 |  |
Stock-based compensation expense | 1,917 | 1,917 |  |
Issuance of common stock under Employee Stock Purchase Plans | 430 | 430 |  |
Issuance of common stock under Employee Stock Purchase Plans, shares |  | 33,000 |  |
Options exercised | 5,156 | 5,156 |  |
Options exercised, shares |  | 610,000 |  |
Shares surrendered in exchange for payment of payroll tax liabilities | (439) | (439) |  |
Shares surrendered in exchange for payment of payroll tax liabilities, shares |  | (31,000) |  |
Shares surrendered in exchange for the exercise of stock options | (1,831) | (1,831) |  |
Shares surrendered in exchange for the exercise of stock options, shares | (131,000) | (131,000) |  |
Ending balance at Dec. 31, 2012 | 381,577 | 172,341 | 210,418 | (1,182)
Ending balance, shares at Dec. 31, 2012 |  | 42,489,000 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income | 16,570 |  | 16,570 |
Other comprehensive loss, net of tax | 2,125 |  |  | 2,125
Excess tax benefits from stock-based compensation | 259 | 259 |  |
Stock-based compensation expense | 1,467 | 1,467 |  |
Issuance of common stock under Employee Stock Purchase Plans | 448 | 448 |  |
Issuance of common stock under Employee Stock Purchase Plans, shares |  | 37,000 |  |
Options exercised | 3,733 | 3,733 |  |
Options exercised, shares | 368,000 | 413,000 |  |
Shares surrendered in exchange for payment of payroll tax liabilities | (21) | (21) |  |
Shares surrendered in exchange for payment of payroll tax liabilities, shares |  | (48,000) |  |
Shares surrendered in exchange for the exercise of stock options | (452) | (452) |  |
Shares surrendered in exchange for the exercise of stock options, shares | (45,000) | (45,000) |  |
Ending balance at Dec. 31, 2013 | $ 405,706 | $ 177,775 | $ 226,988 | $ 943
Ending balance, shares at Dec. 31, 2013 |  | 42,846,000 |  |

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