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Benefit Plans - Assumptions Used (Details) | 12 Months Ended
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Dec. 31, 2019 $ / shares
Options 2010 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Weighted-average fair value of options granted (usd per share) | $ 1.94
Weighted-average risk-free interest rate | 2.54%
Weighted-average expected option lives (in years) | 6 years 6 months
Weighted-average expected volatility | 49.00%
Weighted-average expected dividend yield | 7.40%
Options 2009 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Weighted-average fair value of options granted (usd per share) | $ 2.19
Weighted-average risk-free interest rate | 3.29%
Weighted-average expected option lives (in years) | 6 years 8 months 12 days
Weighted-average expected volatility | 59.08%
Weighted-average expected dividend yield | 6.26%
Options 2008 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Weighted-average fair value of options granted (usd per share) | $ 1.24
Weighted-average risk-free interest rate | 1.33%
Weighted-average expected option lives (in years) | 3 years 7 months 6 days
Weighted-average expected volatility | 59.94%
Weighted-average expected dividend yield | 14.40%

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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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 (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + 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 (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Rate of weighted-average expected volatility for 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 (f)(2)(ii) -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 The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Expected term of 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 (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.D.2) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 + Details
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