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Share-based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2019
Share-based Compensation [Abstract] |
Schedule of Assumptions Used | For the six months ended June 30, 2018, the weighted average input assumptions used were as follows:
Schedule of Share-based Compensation, Stock Options, Activity | The following table is a summary of our stock option activity: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Six months ended June 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 | ​ | (21) | ​ | ​ | 28.87 | ​
Outstanding at end of the period | 97 | ​ | $ | 52.53 | ​ | 136 | ​ | $ | 45.17 | ​
Exercisable at end of the period | 52 | ​ | $ | 40.96 | ​ | 60 | ​ | $ | 29.94 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Restricted Stock Activity | The following table summarizes our restricted stock activity:

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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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