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Common Stock Incentive Plan - Performance Shares and Restricted Stock Units (Details) $ in Millions | 9 Months Ended
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Sep. 30, 2019 USD ($) shares
Performance Shares and Restricted Stock Units |
Common Stock Incentive Plan |
Unamortized share-based compensation expense | $ | $ 10.6
Performance Shares |
Common Stock Incentive Plan |
Shares granted in period (in shares) | 115,137
Vesting rights percentage | 50.00%
Vesting period (in years) | 3 years
Restricted Stock Units |
Common Stock Incentive Plan |
Shares granted in period (in shares) | 5,482
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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- 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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