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Basis of Presentation - Accounting for Stock-Based Compensation (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Stock-based compensation activity, including both continuing and discontinued operations |  |  |  |  |
Stock-based compensation expense recognized in operating expenses | $ 2,986 | $ 3,373 | $ 10,572 | $ 5,853 |
Less: Tax benefit of stock-based compensation expense in provision for income taxes | 1,079 | 1,204 | 3,870 | 2,122 |
Stock-based compensation expense, net of tax | 1,907 | 2,169 | 6,702 | 3,731 |
Fair value of shares vested | 2,687 | 3,601 | 10,337 | 5,951 |
Proceeds to the Company from the exercise of stock-based compensation | 983 | 1,512 | 1,297 | 2,525 |
Tax effect from the exercise of stock-based compensation, including shortfall tax benefits | 0 | 5 | 0 | 19 | $ 232
Fair value of financial instruments |  |  |  |  |
United States Treasury securities and money market funds | $ 3,438 | $ 35,043 | $ 3,438 | $ 35,043 | $ 2,832
Income Taxes |  |  |  |  |
Effective tax rate (as a percent) | 37.20% | 35.80% | 32.20% | 36.70% |
Provision for income taxes | $ 16,712 | $ 14,640 | $ 24,392 | $ 24,703 |
Stock Compensation Plan |  |  |  |  |
Stock-based compensation activity, including both continuing and discontinued operations |  |  |  |  |
Stock-based compensation cost capitalized in inventory | $ 200 | $ 500 | $ 200 | $ 500 |
1994 Plan |  |  |  |  |
Stock-Based Compensation |  |  |  |  |
Requisite service period |  |  | 4 years |  |
Expiration period |  |  | 7 years |  |
2011 Plan |  |  |  |  |
Stock-Based Compensation |  |  |  |  |
Maximum common stock shares that may be issued under plan (in shares) | 150,000 |  | 150,000 |  |
2011 Plan | Stock Options |  |  |  |  |
Stock-Based Compensation |  |  |  |  |
Maximum common stock shares that may be issued under plan (in shares) | 16,300,000 |  | 16,300,000 |  |
2011 Plan | Restricted Stock Units |  |  |  |  |
Stock-Based Compensation |  |  |  |  |
Maximum common stock shares that may be issued under plan (in shares) | 100,000 |  | 100,000 |  |

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- Definition Amount of increase (decrease) in additional paid in capital (APIC) resulting from a tax benefit (deficiency) associated with an share-based compensation plan other than an employee stock ownership plan (ESOP). + References No definition available. + Details
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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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- 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 -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: 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=66902209&loc=d3e3255-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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