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Shared-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2017
Schedule of Share-Based Compensation Expense | Share-based compensation expense during the three and six months ended June 30, 2017 and 2016, consisted of the following amounts:
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Stock options |  | $ | 194 |  |  | $ | 292 |  |  | $ | 575 |  |  | $ | 494 |
Restricted stock |  |  | 395 |  |  |  | 710 |  |  |  | 855 |  |  |  | 1,358 |
Performance share units |  |  | 477 |  |  |  | 482 |  |  |  | 788 |  |  |  | 633 |
Share-based compensation |  | $ | 1,066 |  |  | $ | 1,484 |  |  | $ | 2,218 |  |  | $ | 2,485 |
Reconciliation of Option Activity | The following table provides a reconciliation of option activity for the six months ended June 30, 2017:
Options |  | Shares (000) |  |  | 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 |  |  | (220 | ) |  |  | 11.81 |  |  |  |  |  |  |  |  |
Forfeited or expired |  |  | (6 | ) |  |  | 7.72 |  |  |  |  |  |  |  |  |
Outstanding at June 30, 2017 |  |  | 797 |  |  | $ | 14.22 |  |  |  | 6.6 |  |  | $ | 10,538 | (1)
Exercisable at June 30, 2017 |  |  | 555 |  |  | $ | 12.17 |  |  |  | 5.5 |  |  | $ | 8,490 | (1)
(1) | The intrinsic value is the amount by which the market price of our stock was greater than the exercise price of any individual option grant at June 30, 2017.
Stock Option [Member] |
Weighted Average Assumptions Relevant to Determining the Fair Value at the Dates of Grant | The weighted average assumptions relevant to determining the fair value of the 2017 stock option grants are below:
|  | 2017 Stock Option Awards |
Term |  |  | 6 years |
Risk free interest rate |  |  | 2.03 | %
Dividend yield |  |  | 1.16 | %
Expected volatility |  |  | 56.56 | %
Expected forfeiture rate |  |  | 3.00 | %

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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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