Employee Service Share-based Compensation, Nonvested Awards, Modifications to Awards

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The 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).

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- Definition

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for 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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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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Amount of cost to be recognized for option under share-based payment arrangement.

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Description of service or performance condition required to be met for earning right to award under share-based payment arrangement. Includes, but is not limited to, combination of market, performance or service condition.

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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).

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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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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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- Definition

Gross number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Price of a single share of a number of saleable stocks of a company.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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Accounting for Stock-Based Compensation (Narrative) (Details)				12 Months Ended
	Mar. 01, 2019 USD ($) shares	Mar. 01, 2018 USD ($) shares	Mar. 01, 2017 USD ($) shares	Dec. 31, 2019 USD ($) item $ / shares shares	Dec. 31, 2018 item shares	Dec. 31, 2017 item shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee service share-based compensation, unrecognized compensation costs on nonvested awards \| $				$ 13,000,000
Employee service share-based compensation total compensation cost not yet recognized, period for recognition				22 months
Employee service share-based compensation, nonvested awards, modifications to awards \| item				0	0	0
Options exercised				0	0	0
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee service share-based compensation total compensation cost not yet recognized, period for recognition				26 months
Employee service share-based compensation, unrecognized compensation costs on nonvested stock options \| $				$ 1,000,000
Weighted-average grant date fair value of stock options \| $ / shares				$ 3.05
Share-based compensation arrangement by share-based payment award, options, grants in period				658,500	0	0
Share Price \| $ / shares				$ 2.90
Restricted Stock Units (RSUs) [Member]
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				306,612	296,944	110,988
Restricted Stock [Member]
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				1,989,000	1,987,000	1,502,000
Restricted Stock and Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee service share-based compensation total compensation cost not yet recognized, period for recognition				21 months
Employee service share-based compensation, unrecognized compensation costs on nonvested awards other than options \| $				$ 12,000,000
Plan 2000 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement award vesting rights				one-third increments on each of the first three anniversaries of the award date
Unissued common stock reserved for grants				0
Plan 2009 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement award vesting rights				one-third increments on each of the first three anniversaries of the award date
Unissued common stock reserved for grants				5,308,206
Plan 2009 [Member] \| Outside Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement award vesting rights				one-third increments on each of the first three anniversaries of the award date
Plan 2009 [Member] \| Restricted Stock Units (RSUs) [Member] \| Outside Directors [Member]
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	34,068	37,118	18,498
Fair value of units granted \| $	$ 170,000	$ 170,000	$ 170,000
Contractual Term of Option Granted Prior to 2005 [Member] \| Plan 2000 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual term of option granted				10 years
Contractual Term of Option Granted From 2005 Through 2007 [Member] \| Plan 2000 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual term of option granted				8 years
Contractual Term Of Option Granted Since 2008 [Member] \| Plan 2000 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual term of option granted				10 years
Contractual Term of Option Granted in 2011 or Later [Member] \| Plan 2009 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual term of option granted				10 years