XML 42 R31.htm IDEA: XBRL DOCUMENT
v3.19.2

Share-based Compensation (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2019
Share-based Compensation |
Schedule of status of and changes in the Company's stock option awards | A summary of the status of and changes in the Company's stock option awards for the six months ended June 30, 2019 follows:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted- | ​ | Weighted-
​ | ​ | ​ | ​ | Average | ​ | Average
​ | ​ | ​ | ​ | Exercise | ​ | Remaining Contractual
​ |  | Shares |  | Price |  | Term
Outstanding at beginning of period |  | 87,600 |  | $ | 20.58 | ​ | ​
Exercised |  | (21,799) | ​ |  | 17.71 | ​ | ​
Forfeited |  | (2,271) | ​ |  | 23.53 | ​ | ​
Expired |  | (5,176) | ​ |  | 18.13 | ​ | ​
Outstanding at end of period |  | 58,354 |  | $ | 21.76 |  | 6.23
Exercisable at end of period |  | 42,472 |  | $ | 21.09 |  | 5.80
Summary of the changes in the Company's stock unit awards | A summary of the changes in the Company’s stock unit awards for the six months ended June 30, 2019, is as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted- | ​ | Director | ​ | Weighted-
​ | ​ | Restricted | ​ | Average | ​ | Deferred | ​ | Average
​ | ​ | Stock | ​ | Grant Date | ​ | Stock | ​ | Grant Date
​ |  | Units |  | Fair Value |  | Units |  | Fair Value
Non-vested at beginning of period |  | 690,495 |  | $ | 26.14 |  | 20,449 |  | $ | 27.93
Granted |  | — | ​ |  | — |  | — | ​ |  | —
Dividend equivalents earned |  | 11,359 | ​ |  | 25.56 |  | 1,269 | ​ |  | 25.56
Vested |  | (104,760) | ​ |  | 18.40 |  | (20,195) | ​ |  | 31.29
Forfeited |  | (4,712) | ​ |  | 30.47 |  | (1,523) | ​ |  | 31.62
Non-vested at end of period |  | 592,382 |  | $ | 27.46 |  | — |  | $ | —
Outstanding at end of period |  | 592,382 |  | $ | 27.46 |  | 68,153 |  | $ | 22.27

X
- References No definition available. + Details
Name: | us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the changes in outstanding nonvested shares. + 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
Name: | us-gaap_ScheduleOfNonvestedShareActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration