Number of performance stock unit grants.

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Target percentage of shares of common stock granted as performance stock units, based on the attainment of specified levels of adjusted EBITDA.

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Market value of share based compensation arrangement by share based payment award other than options granted during the period.

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- Definition

Amount of cost capitalized for award under share-based payment arrangement.

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- Definition

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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Amount of noncash expense (reversal of expense) for pension benefits. Excludes other postretirement benefits.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. 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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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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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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Number of additional shares authorized for issuance under share-based payment arrangement.

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

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- Definition

Number of shares issued during the period as a result of an employee stock purchase plan.

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Stock Compensation (Narrative) (Details)		3 Months Ended	12 Months Ended
Stock Compensation (Narrative) (Details)	Aug. 11, 2020 shares	Dec. 31, 2020 USD ($)	Dec. 31, 2020 USD ($) item shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of performance stock unit grants \| item			2
Percentage of target number of shares of common stock granted as Performance Stock Units				83.00%	80.00%
Total fair value \| $			$ 6,700,000	$ 9,800,000	$ 7,300,000
Employees purchased common stock, shares			83,000	61,000	83,000
Capitalized stock compensation expense \| $			$ 592,000	$ 612,000	$ 484,000
Reversal in expense \| $			$ 1,900,000
RSAs, RSUs, And PSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized awards from approved stock incentive plans			335,000		328,000
Aggregate grant date market value \| $			$ 8,300,000		$ 7,500,000
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants of stock options			212,000	169,000	219,000
Unrecognized compensation costs \| $		$ 2,100,000	$ 2,100,000
Expected weighted-average period for recognizing the unrecognized compensation costs, in years			1 year 6 months 29 days
RSAs, RSUs, PSUs, And PSAs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized awards from approved stock incentive plans				507,000
Aggregate grant date market value \| $				$ 15,000,000.0
Unrecognized compensation costs \| $		7,800,000	$ 7,800,000
Restricted Stock Awards (RSAs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized awards from approved stock incentive plans			123,000	93,000	128,000
Expected weighted-average period for recognizing the unrecognized compensation costs, in years			11 months 23 days
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized awards from approved stock incentive plans			141,000	103,000	115,000
Expected weighted-average period for recognizing the unrecognized compensation costs, in years			1 year 9 months
Performance Stock Units (PSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized awards from approved stock incentive plans			70,000	322,000	104,000
Expected weighted-average period for recognizing the unrecognized compensation costs, in years			1 year 7 months 20 days
Short-term PSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of target number of shares of common stock granted as Performance Stock Units			150.00%
Short-term PSUs [Member] \| Share-based Payment Arrangement, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			1 year
Long-term PSUs [Member] \| Share-based Payment Arrangement, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			5 years
Maximum [Member] \| Short-term PSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of target number of shares of common stock granted as Performance Stock Units				150.00%
Maximum [Member] \| Long-term PSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of target number of shares of common stock granted as Performance Stock Units				288.00%
Executive Officer [Member] \| Maximum [Member] \| Long-term PSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of target number of shares of common stock granted as Performance Stock Units				192.00%
2009 Equity And Cash Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase in shares authorized under plan				1,900,000
Grants of stock options	1,400,000
2020 Equity and Cash Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase in shares authorized under plan	4,100,000
Authorized awards from approved stock incentive plans			2,700,000
2020 PSU Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reversal in expense \| $		$ 1,100,000