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Operations and Summary of Significant Accounting Policies - Stock Based Compensation (Details) - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Stock-Based Compensation |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 0 | 0 | 0
Requisite service period for options to vest | 4 years |  |
Vesting period | 3 years |  |
Stock-based compensation activity, including both continuing and discontinued operations |  |  |
Stock-based compensation expense recognized in operating expenses | $ 12,744 | $ 13,113 | $ 11,212
Tax benefit of stock-based compensation expense in provision for income taxes | 4,575 | 4,757 | 3,987
Stock-based compensation expense, net of tax | 8,169 | 8,356 | 7,225
Fair value of shares vested | 11,043 | 13,186 | 10,997
Proceeds to the Company from the exercise of stock-based compensation | 6,610 | 7,976 | 9,720
Tax benefit from exercise of stock-based compensation, including shortfall tax benefits | 0 | (251) | $ (318)
Stock-based compensation cost capitalized in inventory | $ 200 | $ 400 |
2011 Plan | Stock Options |  |  |
Stock-Based Compensation |  |  |
Maximum common stock shares that may be issued under plan | 16,300 |  |

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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