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Basis of Presentation (Details 5) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2013
Stock-based compensation activity, including both continuing and discontinued operations |  |  |  |  |
Stock-based compensation expense recognized in operating expenses | $ 3,264 | $ 2,807 | $ 5,740 | $ 5,686 |
Tax benefit of stock-based compensation expense in provision for income taxes | 1,163 | 896 | 2,073 | 1,944 |
Stock-based compensation expense, net of tax | 2,101 | 1,911 | 3,667 | 3,742 |
Fair value of shares vested | 3,312 | 2,836 | 5,691 | 5,649 |
Proceeds to the Company from the exercise of stock-based compensation | 857 | 280 | 2,626 | 776 |
Tax effect from the exercise of stock-based compensation, including shortfall tax benefits | (51) | (7) | (186) | (1,850) |
Fair value of financial instruments |  |  |  |  |
United States Treasury securities and money market funds included in cash equivalents | 96,996 | 60,725 | 96,996 | 60,725 | 117,571
Income Taxes |  |  |  |  |
Effective tax rate (as a percent) | 36.30% | 37.70% | 37.20% | 39.80% |
Provision for income taxes | 11,667 | 11,177 | 19,271 | 15,434 |
Stock Compensation Plan |  |  |  |  |
Stock-based compensation activity, including both continuing and discontinued operations |  |  |  |  |
Stock-based compensation cost capitalized in inventory | $ 508 | $ 384 | $ 508 | $ 384 |
1994 Plan |  |  |  |  |
Stock-Based Compensation |  |  |  |  |
Requisite service period for options to vest |  |  | 4 years |  |
Expiration period for options granted |  |  | 7 years |  |
Age after which vesting of options granted accelerates if the grantee ceases to be employed by the entity |  |  | 60 years |  |
2011 Plan |  |  |  |  |
Stock-Based Compensation |  |  |  |  |
Maximum common stock shares that may be issued under plan | 16.3 |  | 16.3 |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + 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 FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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