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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2018
Stock-Based Compensation [Abstract] |
Summary of recognized stock-based compensation expense | The following table summarizes stock-based compensation expense recognized:
|  | Fiscal quarters ended |  |  | Six fiscal months ended |
|  | June 30, 2018 |  |  | July 1, 2017 |  |  | June 30, 2018 |  |  | July 1, 2017 |
Restricted stock units |  | $ | 778 |  |  | $ | 676 |  |  | $ | 3,047 |  |  |  | 2,880 |
Phantom stock units |  |  | - |  |  |  | - |  |  |  | 214 |  |  |  | 163 |
Total |  | $ | 778 |  |  | $ | 676 |  |  | $ | 3,261 |  |  |  | 3,043 |
Schedule of unrecognized compensation cost, nonvested awards | The following table summarizes unrecognized compensation cost and the weighted average remaining amortization periods at June 30, 2018 (amortization periods in years):
|  | Unrecognized Compensation Cost |  |  | Weighted Average Remaining Amortization Periods |
Restricted stock units |  | $ | 4,616 |  |  |  | 1.4 |
Phantom stock units |  |  | - |  |  |  | 0.0 |
Total |  | $ | 4,616 |  |  |  |  |
Schedule of share-based compensation, restricted stock units award activity | RSU activity under the 2007 Program as of June 30, 2018 and changes during the six fiscal months then ended are presented below (number of RSUs in thousands):
|  | Number of RSUs |  |  | Weighted Average Grant-date Fair Value per Unit |
Outstanding: |  |  |  |  |  |
January 1, 2018 |  |  | 986 |  |  | $ | 13.34 |
Granted |  |  | 252 |  |  |  | 18.90 |
Vested* |  |  | (334 | ) |  |  | 13.67 |
Cancelled or forfeited |  |  | - |  |  |  | - |
Outstanding at June 30, 2018 |  |  | 904 |  |  | $ | 14.77 |
Expected to vest at June 30, 2018 |  |  | 904 |  |  |  |  |
* The number of RSUs vested includes shares that the Company withheld on behalf of employees to satisfy the statutory tax withholding requirements.
Schedule of share-based compensation arrangement by share-based units, vested and expected to vest | The number of performance-based RSUs that are scheduled to vest increases ratably based on the achievement of defined performance criteria between the established target and maximum levels. RSUs with performance-based vesting criteria are expected to vest as follows (number of RSUs in thousands):
Vesting Date |  | Expected to Vest |  |  | Not Expected to Vest |  |  | Total |
January 1, 2019 |  |  | 213 |  |  |  | - |  |  |  | 213 |
January 1, 2020 |  |  | 167 |  |  |  | - |  |  |  | 167 |
January 1, 2021 |  |  | 141 |  |  |  | - |  |  |  | 141 |
Schedule of share-based compensation, phantom stock units, Activity | Phantom stock unit activity under the phantom stock plan as of June 30, 2018 and changes during the six fiscal months then ended are presented below (number of phantom stock units in thousands):
|  | Number of units |  |  | Grant-date Fair Value per Unit |
Outstanding: |  |  |  |  |  |
January 1, 2018 |  |  | 157 |  |  |  |
Granted |  |  | 10 |  |  | $ | 21.35 |
Dividend equivalents issued |  |  | 1 |  |  |  |  |
Outstanding at June 30, 2018 |  |  | 168 |  |  |  |  |

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the changes in other outstanding share-based compensation awards other than stock options or nonvested awards. + 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)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of number, weighted-average exercise price or conversion ratio, aggregate intrinsic value, and weighted-average remaining contractual term for outstanding performance-based awards that are fully vested and expected to vest. Includes, but is not limited to, unvested awards for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited 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=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the total compensation cost related to nonvested awards not yet recognized and the weighted-average period over which it is expected to be recognized. + 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 (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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