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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
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 cost by type of award.
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Stock options |  | $ | 1,078 |  |  | $ | 687 |  |  | $ | 984 |
Restricted stock |  |  | 1,968 |  |  |  | 2,061 |  |  |  | 2,623 |
Performance share units |  |  | 2,450 |  |  |  | 1,187 |  |  |  | 432 |
Share-based compensation |  | $ | 5,496 |  |  | $ | 3,935 |  |  | $ | 4,039 |
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 each year.
|  | 2017 |  |  | 2016 |  |  | 2015 |
Expected term |  |  | 6 years |  |  |  | 6 years |  |  |  | 6 years |
Risk free interest rate |  |  | 2.03 | % |  |  | 1.43 | % |  |  | 1.43 | %
Dividend yield |  |  | 1.16 | % |  |  | 2.48 | % |  |  | 1.11 | %
Expected volatility |  |  | 56.56 | % |  |  | 59.23 | % |  |  | 59.22 | %
Expected forfeiture rate |  |  | 3.00 | % |  |  | 3.00 | % |  |  | 3.00 | %
Reconciliation of Option Activity | The following table summarizes option activity for the year ended December 31, 2017.
Options |  | Shares (in thousands) |  |  | Weighted- Average Exercise Price (per share) |  |  | Weighted- Average Remaining Contractual Term (years) |  |  | Aggregate Intrinsic Value |
Outstanding at January 1, 2017 |  |  | 897 |  |  | $ | 12.22 |  |  |  |  |  |  |  |  |
Granted |  |  | 126 |  |  |  | 24.20 |  |  |  |  |  |  |  |  |
Exercised |  |  | (263 | ) |  |  | 11.84 |  |  |  |  |  |  | $ | 3,784 |
Forfeited or expired |  |  | (14 | ) |  |  | 14.34 |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2017 |  |  | 746 |  |  | $ | 14.33 |  |  |  | 6.2 |  |  | $ | 9,900 | (1)
Exercisable at December 31, 2017 |  |  | 573 |  |  | $ | 12.75 |  |  |  | 5.5 |  |  | $ | 8,506 | (1)
(1) | The intrinsic value is the amount by which the closing market price of our stock as of December 31, 2017, was greater than the exercise price of any individual option grant.
Reconciliation of Restricted Stock Option Activity | The following table summarizes the status of unvested restricted stock awards as of December 31, 2017, and changes during the year then ended.
|  | Nonvested Restricted Shares (in thousands) |  |  | Weighted Average Grant- Date Fair Value |
Nonvested at January 1, 2017 |  |  | 202 |  |  | $ | 15.01 |
Granted |  |  | 85 |  |  | $ | 24.29 |
Vested |  |  | (135 | ) |  | $ | 15.63 |
Forfeited |  |  | — |  |  | $ | — |
Nonvested at December 31, 2017 |  |  | 152 |  |  | $ | 19.21 |
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. TSR:
|  | Threshold Performance (50% of Shares) |  |  | Target Performance (100% of Shares) |  |  | Maximum Performance (150% of Shares) |
2017 grants |  |  | 35th Percentile |  |  |  | 50th Percentile |  |  |  | 75th Percentile |
2016 grants |  |  | 35th Percentile |  |  |  | 50th Percentile |  |  |  | 75th Percentile |
2015 grants |  |  | 35th Percentile |  |  |  | 50th Percentile |  |  |  | 75th Percentile |
ROIC:
|  | Threshold Performance (35% of Shares) |  |  | Target Performance (100% of Shares) |  |  | Maximum Performance (150% of Shares) |
2017 grants |  |  | 15 | % |  |  | 17.5 | % |  |  | 20 | %
2016 grants |  |  | 15.5 | % |  |  | 18 | % |  |  | 20.5 | %
2015 grants |  |  | 11 | % |  |  | 12.5 | % |  |  | 14 | %
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 |  |  | Shares (in thousands) |  |  | Grant Date Fair Value |
2017 |  |  | 46 |  |  | $ | 29.84 |  |  |  | 53 |  |  | $ | 24.20 |
2016 |  |  | 101 |  |  | $ | 9.38 |  |  |  | 101 |  |  | $ | 11.31 |
2015 |  |  | 36 |  |  | $ | 28.61 |  |  |  | 36 |  |  | $ | 25.16 |
Summary of Status of Unvested PSU Awards | The following table summarizes the status of unvested PSU awards as of December 31, 2017, and changes during the year then ended.
|  | Nonvested TSR Awards |  |  | Nonvested ROIC Awards |
|  | Shares (in thousands) |  |  | Weighted Average Grant-Date Fair Value |  |  | Shares (in thousands) |  |  | Weighted Average Grant-Date Fair Value |
Nonvested at January 1, 2017 |  |  | 124 |  |  | $ | 14.33 |  |  |  | 124 |  |  | $ | 14.87 |
Change in Vesting Estimate (1) |  |  | — |  |  | $ | — |  |  |  | 16 |  |  | $ | 25.16 |
Granted |  |  | 46 |  |  | $ | 29.84 |  |  |  | 53 |  |  | $ | 24.20 |
Vested |  |  | (32 | ) |  | $ | 28.61 |  |  |  | (48 | ) |  | $ | 25.16 |
Forfeited |  |  | (8 | ) |  | $ | 19.19 |  |  |  | (9 | ) |  | $ | 18.03 |
Nonvested at December 31, 2017 |  |  | 130 |  |  | $ | 16.60 |  |  |  | 136 |  |  | $ | 16.27 |
(1) | Represents additional shares expected to be issued in settlement of ROIC Awards that were granted in 2015.

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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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