Number of performance stock unit grants.

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- Definition

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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No definition available.

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- Definition

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

+ References

No definition available.

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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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- Definition

Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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- Definition

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

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- Definition

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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- 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

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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- 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.

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No definition available.

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- Definition

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

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No definition available.

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- Definition

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

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No definition available.

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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)	12 Months Ended
Stock Compensation (Narrative) (Details)	Dec. 31, 2019 USD ($) item shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 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		80.00%
Total fair value \| $	$ 9,800,000	$ 7,300,000	$ 11,100,000
Employees purchased common stock, shares	61,000	83,000	93,000
Capitalized stock compensation expense \| $	$ 612,000	$ 484,000	$ 394,000
RSAs, RSUs, And PSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized awards from approved stock incentive plans		328,000	426,000
Aggregate grant date market value \| $		$ 7,500,000	$ 7,100,000
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants of stock options	169,000	219,000	260,000
Unrecognized compensation costs \| $	$ 2,000,000.0
Expected weighted-average period for recognizing the unrecognized compensation costs, in years	1 year 4 months 24 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 \| $	$ 11,900,000
Restricted Stock Awards (RSAs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized awards from approved stock incentive plans	93,000	128,000	138,000
Expected weighted-average period for recognizing the unrecognized compensation costs, in years	1 year
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized awards from approved stock incentive plans	103,000	115,000	196,000
Expected weighted-average period for recognizing the unrecognized compensation costs, in years	1 year 6 months
Performance Stock Units (PSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized awards from approved stock incentive plans	322,000	104,000	126,000
Percentage of target number of shares of common stock granted as Performance Stock Units	83.00%		92.00%
Expected weighted-average period for recognizing the unrecognized compensation costs, in years	2 years 3 months 18 days
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
Performance Stock Awards (PSAs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized awards from approved stock incentive plans
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