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Share-Based Compensation - Weighted average assumptions used in valuing options (Details) | 3 Months Ended
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Mar. 31, 2020 USD ($) $ / shares shares
Stock Options |
Share-Based Compensation |
Shares issued (in shares) | 0
Additional disclosures |
Total unrecognized compensation cost related to non vested stock option grants | $ | $ 600,000
Weighted-average period over which unrecognized compensation cost is expected to be recognized | 1 year 1 month 24 days
Total fair value of shares vested during the period | $ | $ 641,000
Restricted Stock |
Additional disclosures |
Weighted-average period over which unrecognized compensation cost is expected to be recognized | 2 years 6 months 7 days
Total fair value of shares vested during the period | $ | $ 2,800,000
Restricted Stock Activity and RSUs |
Nonvested at the beginning of the period (in shares) | 69,450
Granted (in shares) | 815
Vested (in shares) | (37,359)
Forfeited (in shares) | (317)
Nonvested at the end of the period (in shares) | 32,589
Weighted-Average Grant-Date Fair Value |
Nonvested at the beginning of the period (in dollars per share) | $ / shares | $ 58.96
Granted (in dollars per share) | $ / shares | 86.75
Vested (in dollars per share) | $ / shares | 72.65
Forfeited (in dollars per share) | $ / shares | 65.86
Nonvested at the end of the period (in dollars per share) | $ / shares | $ 43.89
Additional disclosures |
Total unrecognized compensation cost related to nonvested restricted stock and RSUs granted | $ | $ 850,000
Restricted Stock | Maximum |
Additional disclosures |
Vesting period | 12 months
Restricted Stock Units |
Additional disclosures |
Weighted-average period over which unrecognized compensation cost is expected to be recognized | 1 year 6 months 21 days
Total fair value of shares vested during the period | $ | $ 2,800,000
Restricted Stock Activity and RSUs |
Nonvested at the beginning of the period (in shares) | 324,601
Granted (in shares) | 19,424
Forfeited (in shares) | (2,830)
Nonvested at the end of the period (in shares) | 341,195
Weighted-Average Grant-Date Fair Value |
Nonvested at the beginning of the period (in dollars per share) | $ / shares | $ 76.44
Granted (in dollars per share) | $ / shares | 86.14
Forfeited (in dollars per share) | $ / shares | 81.39
Nonvested at the end of the period (in dollars per share) | $ / shares | $ 76.95
Additional disclosures |
Total unrecognized compensation cost related to nonvested restricted stock and RSUs granted | $ | $ 10,400,000
Target RSU award level (as a percent) | 85.20%
Employee Stock Purchase Plan |
Number Of Stock Issued Pursuant To Restricted Stock Units | 31,435
Performance based restricted stock units |
Additional disclosures |
Performance period | 3 years
Other Performance based restricted stock units |
Additional disclosures |
Performance period | 1 year
Timed based restricted stock units |
Additional disclosures |
Performance period | 4 years

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options. + 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 (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + 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)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + 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)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The number of grants made 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 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 The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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