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Stock Based Compensation (Awards of Restricted Stock) (Details) - Restricted Stock [Member] | 6 Months Ended
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Jun. 30, 2019 $ / shares shares
Ratably Over Period [Member] | 2/21/2019 | Employee Stock [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Shares Granted | shares | 43,250
Grant Date Fair Value Per Share | $ / shares | $ 83.87
Vesting Period | Ratably over 5 years from grant date
Ratably Over Period [Member] | 3/15/2019 | Employee Stock [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Shares Granted | shares | 600
Grant Date Fair Value Per Share | $ / shares | $ 79.55
Vesting Period | Ratably over 5 years from grant date
Ratably Over Period [Member] | 4/01/2019 | Employee Stock [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Shares Granted | shares | 1,090
Grant Date Fair Value Per Share | $ / shares | $ 82.62
Vesting Period | Ratably over 3 years from grant date
Immediate Vest on grant date [Member] | 5/21/2019 | Two Thousand Eighteen Nonemployee Director Stock Plan [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Shares Granted | shares | 6,500
Grant Date Fair Value Per Share | $ / shares | $ 77.08
Vesting Period | Shares vested immediately

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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Net number of non-option equity instruments granted to participants. + 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)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Description of terms of award under share-based payment arrangement. + 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 (a) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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