The number of shares issued to directors for a specific year pursuant to the terms of the deferred compensation plan.

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- Definition

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).

+ References

No definition available.

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Unrecognized cost of unvested share-based compensation awards.

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date.

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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).

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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.

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- Definition

Number of shares under non-option equity instrument agreements that were cancelled as a result of occurrence of a terminating event.

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- Definition

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

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

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No definition available.

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- Definition

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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Accounting for Stock-Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands					12 Months Ended
	Mar. 01, 2018	Mar. 01, 2017	Apr. 29, 2016	Mar. 01, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Common Class A [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Price					$ 2.82
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Unrecognized Compensation Costs on Nonvested Awards					$ 0
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, Shares					296,944	110,988	99,140
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights					one-third increments on each of the first three anniversaries of the award date
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Cancelled			106,005
Share-based compensation expense of cancelled shares			$ 2,000
Granted, Shares					1,987,000	1,502,000	1,611,049
Restricted Stock and Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Unrecognized Compensation Costs on Nonvested Awards					$ 12,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition					21 months
Restricted Stock, Performance-Based Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, Shares					22,021
Plan 2000 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, 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 by Share-based Payment Award, Award Vesting Rights					one-third increments on each of the first three anniversaries of the award date
Unissued common stock reserved for grants					8,639,000
Plan 2009 [Member] \| 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, Award Vesting Rights					one-third increments on each of the first three anniversaries of the award date
Fair value of units granted	$ 170	$ 170		$ 170
Share-based Compensation, Number of Shares Received by Each Director	37,118	18,498		11,017
Contractual Term of Option Granted Prior to 2005 [Member] \| Plan 2000 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation 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]
Share Based Compensation Contractual Term of Option Granted					8 years
Contractual Term Of Option Granted From 2008 Through 2011 [Member] \| Plan 2000 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation 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]
Share Based Compensation Contractual Term of Option Granted					10 years