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Stock Option Plans and Share-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2014
Stock Option Plans and Share-Based Compensation [Abstract] |
PSU % eligible vesting vs Total Shareholder Return - Second year [Table Text Block] | The following table shows the percent of PSUs granted in 2012 eligible for further time-based vesting based on our percentile placement:
Percentile Placement of Our Total Shareholder Return | % of PSUs Eligible for Time- Based Vesting
Below the 35th percentile | —%
At least the 35th percentile, but below the 50th percentile | 50%
At least the 50th percentile | 100%
Schedule of Stock Options Roll Forward [Table Text Block] | A summary of option activity under the 2009 Plan for the three months ended March 31, 2014 is presented below:
Options: |  | Number of Shares |  | Weighted-Average Exercise Price
|  | (in thousands) |  |
Outstanding at December 31, 2013 |  | 3,143 |  |  | $ | 15.82 |
Granted |  | 241 |  |  | $ | 25.43 |
Exercised |  | (401 | ) |  | $ | 15.24 |
Forfeited |  | (38 | ) |  | $ | 16.54 |
Expired |  | (3 | ) |  | $ | 22.99 |
Outstanding at March 31, 2014 |  | 2,942 |  |  | $ | 16.67 |
Vested and expected to vest at March 31, 2014 |  | 2,909 |  |  | $ | 16.61 |
Exercisable at March 31, 2014 |  | 1,810 |  |  | $ | 15.08 |
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] | A summary of activity of both restricted stock and RSUs for the three months ended March 31, 2014 is presented below:
| Restricted Stock |  | Restricted Stock Units
| Number of Shares |  | Weighted-Average Grant Date Fair Value Per Share |  | Number of Shares |  | Weighted-Average Grant Date Fair Value Per Share
| (in thousands) |  |  |  | (in thousands) |  |
Non-vested, December 31, 2013 | 52 |  |  | $ | 18.43 |  |  | 362 |  |  | $ | 17.15 |
Granted | — |  |  | $ | — |  |  | 97 |  |  | $ | 25.54 |
Vested | — |  |  | $ | — |  |  | (31 | ) |  | $ | 15.69 |
Forfeited | — |  |  | $ | — |  |  | (14 | ) |  | $ | 15.45 |
Non-vested, March 31, 2014 | 52 |  |  | $ | 18.43 |  |  | 414 |  |  | $ | 19.27 |
The fair value of restricted stock is the product of the number of shares granted and the closing market price of our common stock on the grant date. Our unrecognized compensation cost related to non-vested restricted stock is approximately $7.2 million and is expected to be recognized over a weighted-average period of 2.8 years.
PSU % eligible vesting vs total Shareholder Return placement - First year [Table Text Block] | A summary of activity of the PSUs for the three months ended March 31, 2014 is presented below:
Performance-based Stock Units | Number of Shares |  | Weighted-Average Grant Date Fair Value Per Share
| (in thousands) |  |
Non-vested, December 31, 2013 | 225 |  |  | $ | 13.32 |
Granted | 132 |  |  | $ | 16.59 |
Vested | (34 | ) |  | $ | 14.81 |
Forfeited | — |  |  | $ | — |
Non-vested, March 31, 2014 | 323 |  |  | $ | 14.41 |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] | The impact on our results for share-based compensation was as follows (in thousands):
| Three Months Ended March 31,
| 2014 |  | 2013
Cost of product and service revenues | $ | 268 |  |  | $ | 305 |
Research and development expenses | 369 |  |  | 289 |
Selling, general and administrative expenses | 2,092 |  |  | 2,332 |
Total share-based compensation expenses | $ | 2,729 |  |  | $ | 2,926 |

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- Definition PSU % eligible vesting - First year [Table Text Block] - For first year (2011) of PSU grants, provides the % of PSUs eligible for time-based vesting as of function of the percentile placement of Total Shareholder Return in that year against the Index + References No definition available. + Details
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- Definition PSU % eligible vesting - Second year [Table Text Block]: Fors the second year (2012) of PSU grants, provides the % of PSUs eligible for time-based vesting as of function of the percentile placement of Total Shareholder Return in that year against the Index + References No definition available. + Details
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- Details
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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=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F 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 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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- Definition Tabular disclosure of the change in stock options. + References No definition available. + Details
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