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Capital Stock and Equity Compensation (Tables) | 6 Months Ended
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Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Assumptions Used in Calculation of Fair Value | Below are the assumptions used in the Monte Carlo calculation on the respective grant dates for awards granted in 2019 and 2018:
| June 3, 2019 |  | February 7, 2019 |  | September 17, 2018 |  | February 8, 2018
Expected volatility | 39.7% |  | 36.7% |  | 36.6% |  | 34.8%
Expected term (in years) | 2.6 |  | 2.9 |  | 3.0 |  | 3.0
Risk-free interest rate | 1.78% |  | 2.43% |  | 2.85% |  | 2.28%
Summary of Activity Under Stock Option Plans | A summary of the activity under our stock option plans for the six months ended June 30, 2019 is presented below:
| Options Outstanding |  | Weighted- Average Exercise Price Per Share |  | Weighted-Average Remaining Contractual Life in Years |  | Aggregate Intrinsic Value
Options outstanding, vested and exercisable as of December 31, 2018 | 10,950 |  |  | $ | 31.99 |  |  | 2.0 |  | $ | 734,469 |
Options exercised | (10,000 | ) |  | $ | 32.74 |  |  |  |  |
Options expired | (300 | ) |  | $ | 23.86 |  |  |  |  |
Options outstanding, vested and exercisable as of June 30, 2019 | 650 |  |  | $ | 24.20 |  |  | 0.6 |  | $ | 96,447 |
Performance-Based Restricted Stock Units |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Restricted Stock Activities | The following table summarizes the change in number of performance-based restricted stock units outstanding for the six months ended June 30, 2019:
| Performance-Based Restricted Stock Units
Awards outstanding as of December 31, 2018 | 142,434 |
Awards granted | 111,087 |
Stock issued | (131,650 | )
Awards forfeited | (11,549 | )
Awards outstanding as of June 30, 2019 | 110,322 |
Time-Based Restricted Stock Units |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Restricted Stock Activities | A summary of activity of the outstanding time-based restricted stock units for the six months ended June 30, 2019 is presented below:
| Time-Based Restricted Stock Units
Awards outstanding as of December 31, 2018 | 117,476 |
Awards granted | 59,561 |
Stock issued | (64,536 | )
Awards forfeited | (7,596 | )
Awards outstanding as of June 30, 2019 | 104,905 |
Deferred Stock Units |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Restricted Stock Activities | The following table summarizes the change in number of deferred stock units outstanding during the six months ended June 30, 2019:
| Deferred Stock Units
Awards outstanding as of December 31, 2018 | 8,400 |
Awards granted | 5,950 |
Stock issued | (7,200 | )
Awards outstanding as of June 30, 2019 | 7,150 |

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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