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Basis of Presentation - Accounting for Stock-Based Compensation (Details) - USD ($) $ in Thousands, shares in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Stock-based compensation activity, including both continuing and discontinued operations |  |  |  |  |
Stock-based compensation expense recognized in operating expenses | $ 3,141 |  | $ 2,794 | $ 8,995 | $ 8,869
Less: Tax benefit of stock-based compensation expense in provision for income taxes | 1,112 |  | 1,005 | 3,262 | 3,144
Stock-based compensation expense, net of tax | 2,029 |  | 1,789 | 5,733 | 5,725
Fair value of shares vested | 3,088 |  | 2,749 | 9,039 | 8,744
Proceeds to the Company from the exercise of stock-based compensation | 4,166 |  | 1,443 | 6,695 | 7,019
Tax effect from the exercise of stock-based compensation, including shortfall tax benefits | 121 | $ (74) | (58) | 140 | (244)
Fair value of financial instruments |  |  |  |  |
United States Treasury securities and money market funds | $ 13,334 | $ 76,047 | $ 76,488 | $ 13,334 | $ 76,488
Income Taxes |  |  |  |  |
Effective tax rate (as a percent) | 34.80% |  | 38.40% | 35.90% | 38.40%
Provision for income taxes | $ 15,898 |  | $ 13,479 | $ 40,601 | $ 33,115
Stock Compensation Plan |  |  |  |  |
Stock-based compensation activity, including both continuing and discontinued operations |  |  |  |  |
Stock-based compensation cost capitalized in inventory | $ 463 |  | $ 464 | $ 463 | $ 464
2011 Plan |  |  |  |  |
Stock-Based Compensation |  |  |  |  |
Maximum common stock shares that may be issued under plan (in shares) | 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 S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: 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 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 + Details
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