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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Assumptions Used in Calculation of Fair Value | Below were the assumptions used in the Monte Carlo calculation:
|  | June 30, 2017 |  | June 30, 2016
Expected volatility |  | 33.6% |  | 29.6%
Expected term (in years) |  | 3.0 |  | 3.0
Risk-free interest rate |  | 1.38% |  | 0.93%
Summary of Activity Under Stock Option Plans | A summary of the activity under our stock option plans during the three and six month periods ended June 30, 2017 and changes during the six months then ended, is presented below:
| Options Outstanding |  | Weighted- Average Exercise Price Per Share |  | Weighted-Average Remaining Contractual Life in Years |  | Aggregate Intrinsic Value
Options outstanding at March 31, 2017 | 94,275 |  |  | $ | 37.46 |  |  | 3.1 |  | $ | 4,563,655 |
Options exercised | (29,317 | ) |  | $ | 38.46 |  |  |  |  |  |
Options forfeited | — |  |  | $ | — |  |  |  |  |  |
Options outstanding at June 30, 2017 | 64,958 |  |  | $ | 37.01 |  |  | 3.0 |  | $ | 4,651,550 |
Options exercisable at June 30, 2017 | 64,958 |  |  | $ | 37.01 |  |  | 3.0 |  | $ | 4,651,550 |
Options vested at June 30, 2017 | 64,958 |  |  | $ | 37.01 |  |  | 3.0 |  | $ | 4,651,550 |
| Options Outstanding |  | Weighted- Average Exercise Price Per Share
Options outstanding at December 31, 2016 | 116,575 |  |  | $ | 37.76 |
Options exercised | (51,617 | ) |  | $ | 36.66 |
Options forfeited | — |  |  | $ | — |
Options outstanding at June 30, 2017 | 64,958 |  |  | $ | 37.01 |
Time Based Restricted Stock |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Restricted Stock Activities | The following table summarizes the change in number of non-vested time-based restricted stock awards outstanding since December 31, 2016:
| Time-Based Restricted Stock Awards
Non-vested awards outstanding at December 31, 2016 | 239,189 |
Awards granted | 77,005 |
Stock issued | (68,142 | )
Awards forfeited | (4,725 | )
Non-vested awards outstanding at June 30, 2017 | 243,327 |
Performance-Based Restricted Stock |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Restricted Stock Activities | The following table summarizes the change in number of non-vested performance-based restricted stock awards outstanding since December 31, 2016:
| Performance-Based Restricted Stock Awards
Non-vested awards outstanding at December 31, 2016 | 151,769 |
Awards granted | 56,147 |
Stock issued | (33,887 | )
Awards forfeited | (3,557 | )
Non-vested awards outstanding at June 30, 2017 | 170,472 |
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 since December 31, 2016:
| Deferred Stock Units
Awards outstanding at December 31, 2016 | 11,900 |
Awards granted | 8,400 |
Stock issued | (11,900 | )
Awards outstanding at June 30, 2017 | 8,400 |

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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired 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=6415400&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 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://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=6415400&loc=d3e5070-113901 + Details
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