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Employee Stock Purchase Plan Stock Options and Warrants Employee Stock Purchase Plan Stock Options and Warrants (Tables) | 12 Months Ended
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Dec. 31, 2011
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] | The stock-based compensation expense before income tax expense for the years ended December 31, 2011, 2010 and 2009, consisted of the following (in thousands):
| 2011 |  | 2010 |  | 2009
Cost of goods sold | $ | 241 |  |  | $ | 201 |  |  | $ | 205 |
Research and development | 86 |  |  | 56 |  |  | 57 |
Selling, general, and administrative | 1,317 |  |  | 1,037 |  |  | 920 |
Stock-based compensation expense before taxes | $ | 1,644 |  |  | $ | 1,294 |  |  | $ | 1,182 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] | In applying the Black-Scholes methodology to the option grants, the fair value of our stock-based awards granted were estimated using the following assumptions for the periods indicated below:
| 2011 |  | 2010 |  | 2009
Risk-free interest rate | 0.68% | - | 1.34% |  | 2.24% |  | 2.7%
Expected option life | 4.2 | - | 6.0 years |  | 6.0 years |  | 6.0 years
Expected dividend yield | —% |  | —% |  | —%
Expected price volatility | 42.11% | - | 45.29% |  | 41.4% |  | 42.4%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding and Exercisable [Table Text Block] | The table below presents information related to stock option activity for the years ended December 31, 2011, 2010 and 2009 (in thousands):
| 2011 |  | 2010 |  | 2009
Total intrinsic value of stock options exercised | $ | 9,433 |  |  | $ | 1,928 |  |  | $ | 2,757 |
Cash received from stock option exercises | 7,197 |  |  | 1,330 |  |  | 1,690 |
Net income tax benefit from the exercises of stock options | 3,122 |  |  | 399 |  |  | 987 |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] | Changes in stock options for the year ended December 31, 2011, consisted of the following (shares and intrinsic value in thousands):
| Number of Shares |  | Weighted Average Exercise Price |  | Remaining Contractual Term (in years) |  | Intrinsic Value
2011: |  |  |  |  |  |  |  |  |  |  |
Beginning balance | 4,389 |  |  | $ | 10.56 |  |  |  |  |  |  |
Granted | 844 |  |  | 13.75 |  |  |  |  |  |  |
Exercised | (1,099 | ) |  | 7.69 |  |  |  |  |  |  |
Forfeited/expired | (57 | ) |  | 13.00 |  |  |  |  |  |  |
Outstanding at December 31 | 4,077 |  |  | 11.96 |  |  | 3.5 |  |  | $ | 7,877 |
Exercisable | 2,744 |  |  | 11.43 |  |  | 2.5 |  |  | 7,090 |
Ending vested and expected to vest | 4,049 |  |  | 11.95 |  |  | 3.5 |  |  | 7,871 |
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] | The following table summarizes information about stock options outstanding at December 31, 2011 (shares in thousands):
|  |  |  |  | Options Outstanding |  | Options Exercisable
Range of Exercise |  | Number Outstanding |  | Weighted Average Remaining Contractual Life (in years) |  | Weighted Average Exercise Price |  | Number Exercisable |  | Weighted Average Exercise Price
$7.65 | - | $9.70 |  |  | 1,021 |  |  | 1.6 |  |  | $ | 8.74 |  |  | 926 |  |  | $ | 8.64 |
$9.71 | - | $11.53 |  |  | 1,111 |  |  | 3.3 |  |  | 10.99 |  |  | 885 |  |  | 10.85 |
$12.02 | - | $13.75 |  |  | 1,286 |  |  | 5.5 |  |  | 13.25 |  |  | 364 |  |  | 12.10 |
$13.82 | - | $17.34 |  |  | 659 |  |  | 2.8 |  |  | 16.09 |  |  | 569 |  |  | 16.45 |
$7.65 | - | $17.34 |  |  | 4,077 |  |  |  |  |  |  |  |  | 2,744 |  |  |  |

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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=6793087&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph g(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph f -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 718 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph (c)(1) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 718 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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