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Equity, Restricted Shares (Details) - Restricted Shares - 2012 Directors Restricted Stock Plan - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Stock-Based Compensation |  |  |  |
Restricted shares available for grant | 81,671 |  |  |
Restricted share activity |  |  |  |
Restricted shares outstanding at the beginning of the period (in shares) | 12,516 | 14,873 | 12,905 |
Restricted shares granted (in shares) | 13,175 | 14,304 | 15,014 |
Shares vested and issued (in shares) | (12,516) | (16,661) | (13,046) |
Restricted shares outstanding at the end of the period (in shares) | 13,175 | 12,516 | 14,873 | 12,905
Fair Value at Grant Date |  |  |  |
Fair value at the grant date, restricted shares outstanding at the beginning of the period (in dollars per share) | $ 89.49 | $ 87.89 | $ 73.25 |
Fair value of restricted shares vested and issued (in dollars per share) | 89.49 | 88.07 | 73.35 |
Fair value of restricted shares granted (in dollars per share) | 91.11 | 89.49 | 87.84 |
Fair value at the grant date, restricted shares outstanding at the end of the period (in dollars per share) | $ 91.11 | $ 89.49 | $ 87.89 | $ 73.25
Weighted Average Remaining Amortization Term (in years) | 4 months 17 days | 4 months 20 days | 4 months 20 days | 4 months 13 days
Total fair value of restricted share awards vested (in dollars) | $ 1.2 | $ 1.5 | $ 1.0 |
Total compensation cost related to non-vested restricted shares not yet recognized (in dollars) | $ 0.5 |  |  |
Weighted average expected amortization period | 4 months 17 days |  |  |

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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=120381028&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=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the 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 (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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