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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Valuation assumptions of granted stock options |
|  | 2011 |  |  | 2010 |  |  | 2009 |
Weighted-average risk-free interest rate |  |  | 1.21 | % |  |  | N/A |  |  |  | N/A |
Dividend yield |  |  | — |  |  |  | N/A |  |  |  | N/A |
Weighted-average expected volatility |  |  | 48.59 | % |  |  | N/A |  |  |  | N/A |
Total weighted-average expected forfeiture rate |  |  | 2.97 | % |  |  | N/A |  |  |  | N/A |
Weighted-average expected life (years) |  |  | 5.90 |  |  |  | N/A |  |  |  | N/A |
Total weighted-average remaining vesting period in years (1) |  |  | 4.30 |  |  |  | 4.57 |  |  |  | 5.60 |
Total fair value of options granted |  | $ | 4,064,000 |  |  |  | N/A |  |  |  | N/A |
Stock-based compensation expense — Cost of sales (1) |  | $ | 60,000 |  |  | $ | 42,000 |  |  | $ | 44,000 |
Stock-based compensation expense — SG&A (1) |  | $ | 1,039,000 |  |  | $ | 963,000 |  |  | $ | 977,000 |
Income tax benefit (1) |  | $ | (390,000 | ) |  | $ | (402,000 | ) |  | $ | (408,000 | )
(1) |  | Information relates to stock options granted since 2006.
Stock option activities of stock option plans |
|  | December 31, |
|  | 2011 |
|  | 2008 Plan |  |  | 1998 Plan |
Maximum number of securities for issuance |  |  | 1,000,000 |  |  |  | N/A |
Number of awards available to be granted |  |  | 344,370 |  |  |  | N/A |
Number of qualified options outstanding |  |  | 505,330 |  |  |  | 11,000 |
Number of qualified options exercisable |  |  | 78,065 |  |  |  | 11,000 |
|  | 2011 |
|  |  |  |  |  | Weighted-Average |
|  | Shares |  |  | Exercise Price |
Outstanding at beginning of year |  |  | 389,026 |  |  | $ | 8.41 |
Granted |  |  | 249,000 |  |  | $ | 34.41 |
Exercised |  |  | (114,996 | ) |  | $ | 6.54 |
Cancelled, forfeited or expired |  |  | (6,700 | ) |  | $ | 9.69 |
Outstanding at end of year |  |  | 516,330 |  |  | $ | 21.34 |
Exercisable at end of year |  |  | 89,065 |  |  | $ | 8.85 |
|  | 2011 |  |  | 2010 |  |  | 2009 |
Weighted-average fair value per option granted during year |  | $ | 16.00 |  |  |  | N/A |  |  | $ | N/A |
Total intrinsic value of options exercised during the year |  | $ | 3,294,000 |  |  | $ | 441,000 |  |  | $ | 3,051,000 |
Total fair value of options vested during the year |  | $ | 208,000 |  |  | $ | 214,000 |  |  | $ | 220,000 |
|  | 2011 |
|  |  |  |  |  | Weighted-Average |
|  | Shares |  |  | Exercise Price |
Outstanding at beginning of year |  |  | 374,600 |  |  | $ | 7.83 |
Granted |  |  | 5,000 |  |  | $ | 34.50 |
Exercised |  |  | (63,075 | ) |  | $ | 7.05 |
Surrendered, forfeited, or expired |  |  | — |  |  |  |  |
Outstanding at end of year |  |  | 316,525 |  |  | $ | 8.41 |
Exercisable at end of year |  |  | 66,325 |  |  | $ | 7.97 |
|  | 2011 |  |  | 2010 |  |  | 2009 |
Weighted-average fair value per option granted during year |  | $ | 16.25 |  |  |  | N/A |  |  |  | N/A |
Total intrinsic value of options exercised during the year |  | $ | 2,110,000 |  |  | $ | 805,000 |  |  | $ | 2,201,000 |
Total fair value of options vested during the year |  | $ | 730,000 |  |  | $ | 721,000 |  |  | $ | 721,000 |
Stock options outstanding and exercisable | The following table summarizes information about qualified stock options outstanding and exercisable at December 31, 2011:
|  | Stock Options Outstanding |
|  |  |  |  |  | Weighted- |  |  |  |  |  |  |
|  |  |  |  |  | Average |  |  | Weighted- |  |  | Intrinsic |
|  |  |  |  |  | Remaining |  |  | Average |  |  | Value of |
|  | Shares |  |  | Contractual Life |  |  | Exercise |  |  | Shares |
Exercise Prices |  | Outstanding |  |  | in Years |  |  | Price |  |  | Outstanding |
$5.10 |  |  | 11,000 |  |  |  | 3.92 |  |  | $ | 5.10 |  |  | $ | 252,000 |
$7.86 — $8.17 |  |  | 48,375 |  |  |  | 6.95 |  |  | $ | 7.87 |  |  | $ | 976,000 |
$9.69 — $9.97 |  |  | 207,955 |  |  |  | 6.83 |  |  | $ | 9.69 |  |  | $ | 3,813,000 |
$29.99 — $34.50 |  |  | 249,000 |  |  |  | 9.90 |  |  | $ | 34.41 |  |  | $ | — |
$5.10 — $34.50 |  |  | 516,330 |  |  |  | 8.26 |  |  | $ | 21.34 |  |  | $ | 5,041,000 |
|  | Stock Options Exercisable |
|  |  |  |  |  | Weighted- |  |  |  |  |  |  |
|  |  |  |  |  | Average |  |  | Weighted- |  |  | Intrinsic |
|  |  |  |  |  | Remaining |  |  | Average |  |  | Value of |
|  | Shares |  |  | Contractual Life |  |  | Exercise |  |  | Shares |
Exercise Prices |  | Exercisable |  |  | in Years |  |  | Price |  |  | Exercisable |
$5.10 |  |  | 11,000 |  |  |  | 3.92 |  |  | $ | 5.10 |  |  | $ | 252,000 |
$7.86 — $8.17 |  |  | 13,530 |  |  |  | 6.94 |  |  | $ | 7.87 |  |  | $ | 273,000 |
$9.69 — $9.97 |  |  | 64,535 |  |  |  | 6.83 |  |  | $ | 9.69 |  |  | $ | 1,184,000 |
$29.99 — $34.50 |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |
$5.10 — $34.50 |  |  | 89,065 |  |  |  | 6.49 |  |  | $ | 8.85 |  |  | $ | 1,709,000 |
|  | Stock Options Outstanding |
|  |  |  |  |  | Weighted- |  |  |  |  |  |  |
|  |  |  |  |  | Average |  |  | Weighted- |  |  | Intrinsic |
|  |  |  |  |  | Remaining |  |  | Average |  |  | Value of |
|  | Shares |  |  | Contractual Life |  |  | Exercise |  |  | Shares |
Exercise Prices |  | Outstanding |  |  | in Years |  |  | Price |  |  | Outstanding |
$7.86 |  |  | 36,525 |  |  |  | 6.92 |  |  | $ | 7.86 |  |  | $ | 737,000 |
$8.01 |  |  | 275,000 |  |  |  | 4.75 |  |  | $ | 8.01 |  |  | $ | 5,505,000 |
$34.50 |  |  | 5,000 |  |  |  | 9.92 |  |  | $ | 34.50 |  |  | $ | — |
$7.86 — $34.50 |  |  | 316,525 |  |  |  | 5.08 |  |  | $ | 8.41 |  |  | $ | 6,242,000 |
|  | Stock Options Exercisable |
|  |  |  |  |  | Weighted- |  |  |  |  |  |  |
|  |  |  |  |  | Average |  |  | Weighted- |  |  | Intrinsic |
|  |  |  |  |  | Remaining |  |  | Average |  |  | Value of |
|  | Shares |  |  | Contractual Life |  |  | Exercise |  |  | Shares |
Exercise Prices |  | Exercisable |  |  | in Years |  |  | Price |  |  | Exercisable |
$7.86 |  |  | 16,325 |  |  |  | 6.92 |  |  | $ | 7.86 |  |  | $ | 329,000 |
$8.01 |  |  | 50,000 |  |  |  | 4.75 |  |  | $ | 8.01 |  |  | $ | 1,001,000 |
$34.50 |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |
$7.86 — $34.50 |  |  | 66,325 |  |  |  | 5.28 |  |  | $ | 7.97 |  |  | $ | 1,330,000 |

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