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Interval between employee stock purchases.

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Percentage of dividend.

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Percentage of eligible compensation allowed, per grant purchase.

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Stock repurchase program additional authorized amount.

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Stock repurchase program, cumulative purchase, amount.

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

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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

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Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format.

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Year the dividend will be paid, in CCYY format.

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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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The cash outflow to reacquire common stock during the period.

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Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement.

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

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

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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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Number of shares used to settle grantee's tax withholding obligation for award under share-based payment arrangement.

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

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Aggregate change in value for stock issued during the period as a result of employee stock purchase plan.

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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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Total cost of shares repurchased divided by the total number of shares repurchased.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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Shareholders' Equity (Narrative) (Details) - USD ($)									1 Months Ended		12 Months Ended
Shareholders' Equity (Narrative) (Details) - USD ($)	Jan. 02, 2021	Dec. 18, 2020	Sep. 25, 2020	Jun. 30, 2020	Dec. 20, 2019	Jul. 10, 2019	Dec. 21, 2018	Jun. 29, 2018	Dec. 27, 2019	Dec. 31, 2012	Jan. 01, 2021	Dec. 27, 2019	Dec. 28, 2018	Jul. 30, 2002
Equity, Class of Treasury Stock [Line Items]
Number of shares available for future issuance under the plans											2,052,508
Stock repurchase authorized											$ 147,200,000			$ 5,000,000.0
Additional stock repurchase authorized											142,200,000
Amount available under repurchase plan											4,300,000
Cumulative purchases											142,900,000
Total cost											2,367,000	$ 5,283,000	$ 1,204,000
Cumulative cash used to repurchase of stock											$ 4,508,000	$ 7,807,000	$ 4,786,000
Dividend declared										$ 0.10	$ 0.38	$ 0.36	$ 0.34
Dividends payable, date of record		Dec. 18, 2020	Sep. 25, 2020	Jun. 30, 2020	Dec. 20, 2019	Jul. 10, 2019	Dec. 21, 2018	Jun. 29, 2018
Dividend payment		$ 9,100,000	$ 9,100,000	$ 9,100,000	$ 11,200,000	$ 11,200,000	$ 10,800,000	$ 10,800,000	$ 5,800,000		$ 9,147,000	$ 11,567,000	$ 10,818,000
Dividend payable, year		2020	2020	2020
Subsequent Event [Member]
Equity, Class of Treasury Stock [Line Items]
Dividend declared	$ 0.40
Dividends payable, date of record	Mar. 26, 2021
Dividend payment date	Apr. 08, 2021
Percentage of dividend	5.00%
Subsequent Event [Member] \| First Quarter [Member]
Equity, Class of Treasury Stock [Line Items]
Dividend declared	$ 0.10
Director [Member]
Equity, Class of Treasury Stock [Line Items]
Repurchase of common stock											37,000
Purchase price per share											$ 17.43
Total cost											$ 700,000
Share Repurchase Plan [Member]
Equity, Class of Treasury Stock [Line Items]
Repurchase of common stock											184,000	339,000
Purchase price per share											$ 12.84	$ 15.60
Total cost											$ 2,400,000	$ 5,300,000
Cumulative [Member]
Equity, Class of Treasury Stock [Line Items]
Repurchase of common stock											27,600,000	27,400,000
Purchase price per share											$ 5.19	$ 5.14
Tax Withholding [Member]
Equity, Class of Treasury Stock [Line Items]
Shares withheld and not issued											139,000	132,000
Cost of shares withheld and not issued											$ 2,100,000	$ 2,500,000
Stock Option [Member]
Equity, Class of Treasury Stock [Line Items]
Percentage of eligible compensation allowed, per grant purchase											10.00%
Interval between employee stock purchases											6 months
Employee purchase price as percentage of trading value											95.00%
Aggregate fair market value of shares purchased by an employee											$ 25,000
Employee stock purchase plan, expiration date											Jul. 01, 2023
Total number of shares available for purchase under the plans											73,573
Shares issued under ESPP											56,679	51,548	55,045
Proceeds from ESPP											$ 800,000	$ 800,000	$ 800,000
Additional shares authorized											250,000
Number of shares available for future issuance under the plans											279,606