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Share-based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2019
Share-based Compensation [Abstract] |
Schedule of Assumptions Used |
​ | ​
​ | 2018
Expected term (in years) | 6.4
Risk-free interest rate | 2.64%
Expected volatility | 33.30%
Dividend yield | 2.87%
Schedule of Share-based Compensation, Stock Options, Activity | The following table is a summary of our stock option activity: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Nine months ended September 30,
​ | 2019 | ​ | 2018
​ | Shares | ​ | Weighted-Average Exercise Price | ​ | Shares | ​ | Weighted-Average Exercise Price
(shares in thousands) | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Outstanding at beginning of period | 107 | ​ | $ | 49.26 | ​ | 106 | ​ | $ | 31.18
Granted | - | ​ | ​ | - | ​ | 51 | ​ | ​ | 67.50
Exercised | (10) | ​ | ​ | 28.21 | ​ | (23) | ​ | ​ | 28.87
Forfeited | - | ​ | ​ | - | ​ | (8) | ​ | ​ | 31.09
Outstanding at end of the period | 97 | ​ | $ | 52.53 | ​ | 126 | ​ | $ | 46.51
Exercisable at end of the period | 52 | ​ | $ | 40.96 | ​ | 54 | ​ | $ | 30.21
Restricted Stock Activity |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Nine months ended September 30,
​ | 2019 | ​ | 2018
​ | Shares | ​ | Weighted-Average Grant Date Fair Value | ​ | Shares | ​ | Weighted-Average Grant Date Fair Value
(shares in thousands) | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Outstanding at beginning of period | 57 | ​ | $ | 50.55 | ​ | 129 | ​ | $ | 32.15
Granted | 28 | ​ | ​ | 130.89 | ​ | 18 | ​ | ​ | 79.80
Vested | (32) | ​ | ​ | 47.14 | ​ | (86) | ​ | ​ | 31.61
Forfeited | (2) | ​ | ​ | 167.48 | ​ | - | ​ | ​ | -
Outstanding at end of the period | 51 | ​ | $ | 91.98 | ​ | 61 | ​ | $ | 46.90

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + 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 (c)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=116856206&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://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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