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Stockholders' Equity Performance Awards (Details) - Performance Shares [Member] - shares					12 Months Ended
	Dec. 02, 2019	Nov. 04, 2019	Aug. 01, 2019	Feb. 20, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	35,000	9,123	14,000	248,500	306,623	113,320	105,540
Expected life (years)	4 years 29 days	4 years 1 month 28 days	4 years 5 months 1 day	4 years 10 months 10 days
Expected volatility	28.47%	28.39%	27.01%	25.70%
Risk-free interest rate	1.64%	1.60%	1.68%	2.47%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Forfeiture rate	7.17%	7.17%	7.17%	7.17%

X

- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Forfeiture Rate

+ References

No definition available.

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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

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-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

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- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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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.

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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.

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