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Common Stock Incentive Plan - Restricted Stock (Details) - Restricted Stock $ in Millions | 9 Months Ended
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Sep. 30, 2019 USD ($) shares
Common Stock Incentive Plan |
Shares granted in period (in shares) | 81,927
Unamortized share-based compensation expense | $ | $ 11.3
Board of Directors |
Common Stock Incentive Plan |
Shares granted in period (in shares) | 32,000
Board of Directors | Vest immediately |
Common Stock Incentive Plan |
Shares granted in period (in shares) | 20,000
Board of Directors | Vest over one-year service period |
Common Stock Incentive Plan |
Shares granted in period (in shares) | 4,000
Vesting period (in years) | 1 year
Board of Directors | Vest over three-year service period |
Common Stock Incentive Plan |
Shares granted in period (in shares) | 8,000
Vesting period (in years) | 3 years
Employees | Vest over four-year service period |
Common Stock Incentive Plan |
Vesting period (in years) | 4 years

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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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