Stock Compensation Plans (EPS PSUs Activity) (Details) - EPS PSUs - $ / shares shares in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Shares (in thousands)
Nonvested shares, beginning of period (shares)	263
Granted (shares)	203
Vested (shares)	0
Forfeited (shares)	(122)
Nonvested shares, end of period (shares)	344	263
Weighted-Average Grant-Date Fair Value
Nonvested shares, beginning of period (in dollars per share)	$ 32.58
Granted (in dollars per share)	19.06	$ 27.23	$ 35.36
Vested (in dollars per share)	0
Forfeited (in dollars per share)	32.71
Nonvested shares, end of period (in dollars per share)	$ 24.58	$ 32.58
Management
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of maximum amount available for issuance	10.00%	0.00%	0.00%

Percentage of maximum amount available for issuance.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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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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The weighted average 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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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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-Publisher FASB
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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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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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