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Basis of Presentation - Accounting for Stock-Based Compensation (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Stock-based compensation activity, including both continuing and discontinued operations |  |  |  |  |
Stock-based compensation expense recognized in operating expenses | $ 370 | $ 3,141 | $ 10,942 | $ 8,995 |
Less: Tax benefit of stock-based compensation expense in provision for income taxes | 58 | 1,112 | 3,962 | 3,262 |
Stock-based compensation expense, net of tax | 312 | 2,029 | 6,980 | 5,733 |
Fair value of shares vested | 428 | 3,088 | 10,764 | 9,039 |
Proceeds to the Company from the exercise of stock-based compensation | 2,268 | 4,166 | 3,566 | 6,695 |
Tax effect from the exercise of stock-based compensation, including shortfall tax benefits (1) | 0 | 121 | 0 | 140 | $ 111
Fair value of financial instruments |  |  |  |  |
Money Market Funds | 5,409 | 13,334 | 5,409 | 13,334 | $ 2,832
Contingent Consideration | $ 1,314 | $ 0 | $ 1,314 | $ 0 |
Income Taxes |  |  |  |  |
Effective tax rate (as a percent) | 37.00% | 34.80% | 34.00% | 35.90% |
Provision for income taxes | $ 16,581 | $ 15,898 | $ 40,972 | $ 40,601 |
Stock Compensation Plan |  |  |  |  |
Stock-based compensation activity, including both continuing and discontinued operations |  |  |  |  |
Stock-based compensation cost capitalized in inventory | 300 | $ 500 | $ 300 | $ 500 |
Restricted Stock Units |  |  |  |  |
Stock-based compensation activity, including both continuing and discontinued operations |  |  |  |  |
Reversed Stock-Based Compensation Expense | $ 1,600 |  |  |  |
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 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=96867065&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=96867065&loc=d3e5070-113901 + Details
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