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Share-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of Share-Based Compensation Expense | The following summarizes share-based compensation expense recorded:
|  | Year ended December 31, |
|  | 2014 |  |  | 2013 |  |  | 2012 |
|  | (in thousands) |
Cost of sales |  | $ | 337 |  |  | $ | 662 |  |  | $ | 432 |
Selling, general and administrative expenses |  |  | 2,609 |  |  |  | 2,398 |  |  |  | 2,616 |
Total |  | $ | 2,946 |  |  | $ | 3,060 |  |  | $ | 3,048 |
Summary of Status of Company's Stock Options | A summary of status of the Company’s stock options as of December 31, 2014 and changes during the three years then ended is presented below:
|  | Options |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Life |  |  | Aggregate Intrinsic Value |
|  |  |  |  |  |  |  | (in years) |  |  | (in thousands) |
Balance, December 31, 2011 |  |  | 71,597 |  |  |  | 21.26 |  |  |  |  |  |  |  |  |
Options granted |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Options exercised |  |  | (24,597 | ) |  |  | 17.58 |  |  |  |  |  |  |  |  |
Options cancelled |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Balance, December 31, 2012 |  |  | 47,000 |  |  |  | 23.19 |  |  |  |  |  |  |  |  |
Options granted |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Options exercised |  |  | (7,000 | ) |  |  | 10.31 |  |  |  |  |  |  |  |  |
Options cancelled |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Balance, December 31, 2013 |  |  | 40,000 |  |  |  | 25.44 |  |  |  |  |  |  |  |  |
Options granted |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Options exercised |  |  | (2,000 | ) |  |  | 14.00 |  |  |  |  |  |  |  |  |
Options cancelled |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Balance, December 31, 2014 |  |  | 38,000 |  |  |  | 26.05 |  |  |  |  |  |  |  |  |
Exercisable and Outstanding, December 31, 2014 |  |  | 38,000 |  |  |  | 26.05 |  |  |  | 3.68 |  |  | $ | 424 |
Summary of Information about Stock Options Outstanding | The following table summarizes information about stock options outstanding at December 31, 2014:
Options Outstanding |  | Options Exercisable
Exercise Price Per Share |  | Number of Options |  |  | Weighted Average Remaining Contractual Life (years) |  | Weighted Average Exercise Price Per Share |  | Number of Options |  |  | Weighted Average Exercise Price Per Share
$22.07 |  |  | 4,000 |  |  | 0.36 |  | 22.07 |  |  | 4,000 |  |  | 22.07
$24.15 |  |  | 24,000 |  |  | 5.25 |  | 24.15 |  |  | 24,000 |  |  | 24.15
$28.31 |  |  | 4,000 |  |  | 1.16 |  | 28.31 |  |  | 4,000 |  |  | 28.31
$34.77 |  |  | 6,000 |  |  | 1.28 |  | 34.77 |  |  | 6,000 |  |  | 34.77
|  |  | 38,000 |  |  | 3.68 |  | 26.05 |  |  | 38,000 |  |  | 26.05
Summary of Estimated Fair Value Assumptions on Date of Grant | The Company estimates the fair value of Restricted Stock Units (“RSUs”) and Performance Stock Awards (“PSAs”) using the value of the Company’s stock on the date of grant, with the exception of market-based PSAs, for which a Monte Carlo simulation model is used. The assumptions used in the Monte Carlo simulation model for PSAs granted during each year were:
|  | 2014 |  | 2013 |  | 2012
Expected stock price volatility |  | 23.7% - 65.0% |  | 24.6% - 60.1% |  | 33.3% - 75.7%
Risk free interest rate |  | 0.61% |  | 0.41% |  | 0.24%
Expected dividend yield |  | 0% |  | 0% |  | 0%
Summary of Status of Company's RSUs and PSAs | A summary of status of the Company’s RSUs and PSAs as of December 31, 2014 and changes during the three years then ended is presented below:
|  | Number of RSUs and PSAs (1) |  |  | Weighted Average Grant Date Fair Value |
Unvested RSUs and PSAs at December 31, 2011 |  |  | 193,981 |  |  | $ | 24.41 |
RSUs and PSAs granted |  |  | 115,306 |  |  |  | 29.06 |
Unvested RSUs and PSAs cancelled |  |  | (39,306 | ) |  |  | 28.44 |
RSUs and PSAs vested |  |  | (26,840 | ) |  |  | 23.13 |
Unvested RSUs and PSAs at December 31, 2012 |  |  | 243,141 |  |  |  | 26.11 |
RSUs and PSAs granted |  |  | 117,966 |  |  |  | 34.24 |
Unvested RSUs and PSAs cancelled |  |  | (16,002 | ) |  |  | 27.45 |
RSUs and PSAs vested |  |  | (88,018 | ) |  |  | 23.37 |
Unvested RSUs and PSAs at December 31, 2013 |  |  | 257,087 |  |  |  | 30.69 |
RSUs and PSAs granted |  |  | 87,353 |  |  |  | 41.76 |
Unvested RSUs and PSAs cancelled |  |  | (32,756 | ) |  |  | 32.36 |
RSUs and PSAs vested (2) |  |  | (80,469 | ) |  |  | 25.81 |
Unvested RSUs and PSAs at December 31, 2014 |  |  | 231,215 |  |  | $ | 36.34 |
(1) | The number of shares disclosed in this table are at the target level of 100%.
(2) | 13,161 additional shares were vested for performance share awards that were granted in 2011 for the three-year performance period ended December 31, 2013, based on achievement of an actual payout percentage of 143%.

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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + 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 SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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