Number of Share-based Compensation Plans

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- Definition

Stock Repurchase Program, Number of Shares Repurchased to Date, Shares

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Stock Repurchase Program, Number of Shares Repurchased to Date, Value

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- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

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Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding.

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- Definition

Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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- Definition

Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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- Definition

Amount of cash inflow from exercise of option under share-based payment arrangement.

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- Definition

Amount of noncash expense for 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

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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- Definition

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

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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

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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- Definition

Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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Shareholders' Equity (Details)			12 Months Ended
Shareholders' Equity (Details)	Oct. 28, 2013 $ / shares	Feb. 29, 2012 $ / shares	Dec. 31, 2020 USD ($) plans $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividends per share of common stock (in dollars per share) \| $ / shares	$ 0.20	$ 0.15	$ 0.80	$ 0.80	$ 0.80
Dividends payable			$ 5,775,000	$ 5,684,000	$ 5,626,000
Preferred stock, shares authorized (in shares) \| shares			500,000	500,000
Preferred stock, par value (in dollars per per share) \| $ / shares			$ 0.01	$ 0.01
Shares authorized under repurchase program			$ 200,000,000.0
Total stock repurchased under plan, shares \| shares			6,100,000
Total stock repurchased under plan, value			$ 162,600,000
Remaining authorized repurchase amount			$ 37,400,000
Number of shares reserved for share-based compensation plans \| shares			7,100,000
Number of share-based compensation plans \| plans			2
Number of shares available for grant \| shares			3,800,000
Stock-based compensation			$ 13,111,000	$ 11,779,000	10,037,000
Tax benefit from stock-based compensation			3,200,000	2,800,000	2,300,000
Proceeds from stock options exercised			$ 13,700,000	$ 7,700,000	$ 3,500,000
Stock Options and Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period from date of grant (in years)			10 years
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting term (in years)			4 years
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting term (in years)			5 years