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Stock-Based Compensation, Nonvested Restricted Stock Awards (Details) - Restricted Stock Awards [Member]	12 Months Ended
	Dec. 31, 2020 $ / shares shares
Number of Shares [Roll Forward]
Nonvested at beginning of year (in shares) | shares	573,100
Granted (in shares) | shares	614,600
Vested (in shares) | shares	(220,100)
Forfeited (in shares) | shares	(36,500)
Nonvested at end of year (in shares) | shares	931,100
Weighted-Average Grant Date Fair Value [Abstract]
Nonvested, beginning balance (in dollars per share) | $ / shares	$ 58.99
Granted (in dollars per share) | $ / shares	38.58
Vested (in dollars per share) | $ / shares	56.50
Forfeited (in dollars per share) | $ / shares	51.98
Nonvested, Ending Balance (in dollars per share) | $ / shares	$ 46.38

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

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-Publisher FASB
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-Section 50
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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 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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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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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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