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Shared-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Components of Share-Based Compensation Expense by Type of Award | The following table lists the components of share-based compensation expense by type of award.
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2018 |  | 2017 |  | 2018 |  | 2017
Stock options |  | $ | 173 |  |  | $ | 527 |  |  | $ | 531 |  |  | $ | 1,102 |
Restricted stock |  | 388 |  |  | 773 |  |  | 1,244 |  |  | 1,628 |
Performance share units |  | 530 |  |  | 467 |  |  | 1,650 |  |  | 1,255 |
Change in estimate of performance share vesting (1) |  | (802 | ) |  | $ | — |  |  | (802 | ) |  | — |
Share-based compensation expense |  | $ | 289 |  |  | $ | 1,767 |  |  | $ | 2,623 |  |  | $ | 3,985 |
Weighted Average Assumptions Relevant to Determining the Fair Value at the Dates of Grant and Stock Option Modification | The following table shows the weighted average assumptions relevant to determining the fair value of stock options granted in 2018.
| 2018 Stock Option Awards
Expected term | 6 years |
Risk free interest rate | 2.66 | %
Dividend yield | 1.15 | %
Expected volatility | 47.69 | %
Expected forfeiture rate | 4.00 | %
Reconciliation of Option Activity | The following table summarizes option activity for the nine months ended September 30, 2018.
Options |  | Shares (in thousands) |  | Weighted- Average Exercise Price (per share) |  | Weighted- Average Remaining Contractual Term (years) |  | Aggregate Intrinsic Value |  |
Outstanding at January 1, 2018 |  | 746 |  |  | $ | 14.33 |  |  |  |  |  |  |
Granted |  | 58 |  |  | 24.41 |  |  |  |  |  |  |
Exercised |  | (27 | ) |  | 10.15 |  |  |  |  | $ | 477 |  |  |
Forfeited or expired |  | (4 | ) |  | 23.51 |  |  |  |  |  |  |
Outstanding at September 30, 2018 |  | 773 |  |  | $ | 15.19 |  |  | 5.9 |  | $ | 319 |  |  | (1)
Exercisable at September 30, 2018 |  | 626 |  |  | $ | 13.63 |  |  | 5.2 |  | $ | 1,232 |  |  | (1)
Reconciliation of Restricted Stock Option Activity | The following table summarizes the status of unvested restricted stock awards as of September 30, 2018, and changes during the nine months then ended.
|  | Nonvested Restricted Shares (in thousands) |  | Weighted Average Grant-Date Fair Value (per share)
Nonvested at January 1, 2018 |  | 152 |  |  | $ | 19.21 |
Granted |  | 87 |  |  | $ | 24.55 |
Vested |  | (93 | ) |  | $ | 19.69 |
Nonvested at September 30, 2018 |  | 146 |  |  | $ | 22.07 |
Schedule of Performance Based Awards Goals with Respect to TSR and ROIC | The following table presents the goals with respect to TSR and ROIC for each award granted in 2018.
TSR: |  |  |  | Threshold Performance (50% of Shares) |  | Target Performance (100% of Shares) |  | Maximum Performance (150% of Shares)
|  | 2018 grants |  | 35th Percentile |  | 50th Percentile |  | 75th Percentile
ROIC: |  |  |  | Threshold Performance (35% of Shares) |  | Target Performance (100% of Shares) |  | Maximum Performance (150% of Shares)
| 2018 grants |  | 15.5 | % |  | 18.0 | % |  | 19.5 | %
Schedule of Number of Awards Granted and Grant Date Fair Value of Each Award in Periods | The following table presents the number of awards granted and the grant date fair value of each award in the periods presented.
|  | TSR Awards |  | ROIC Awards
Award Year |  | Shares (in thousands) |  | Grant Date Fair Value (per share) |  | Shares (in thousands) |  | Grant Date Fair Value (per share)
2018 |  | 55 |  |  | $ | 24.65 |  |  | 55 |  |  | $ | 24.55 |
Summary of Status of Unvested PSU Awards | The following table summarizes the status of unvested PSU awards as of September 30, 2018, and changes during the nine months then ended. All PSUs that vested on December 31, 2017, were settled in shares in May 2018.
|  | Nonvested TSR Awards |  | Nonvested ROIC Awards
|  | Shares (in thousands) |  | Weighted Average Grant-Date Fair Value (per share) |  | Shares (in thousands) |  | Weighted Average Grant-Date Fair Value (per share)
Nonvested at January 1, 2018 |  | 130 |  |  | $ | 16.60 |  |  | 136 |  |  | $ | 16.27 |
Granted |  | 55 |  |  | $ | 24.65 |  |  | 55 |  |  | $ | 24.55 |
Forfeited |  | (13 | ) |  | $ | 14.50 |  |  | (14 | ) |  | $ | 14.86 |
Nonvested at September 30, 2018 |  | 172 |  |  | $ | 18.47 |  |  | 177 |  |  | $ | 18.31 |

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- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&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=96867065&loc=d3e5070-113901 + Details
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