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

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The cash outflow to reacquire common stock during the period.

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

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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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Shareholders' Equity (Narrative) (Details) - USD ($)															1 Months Ended			12 Months Ended
Shareholders' Equity (Narrative) (Details) - USD ($)	Apr. 08, 2022	Mar. 26, 2022	Feb. 17, 2022	Jan. 01, 2022	Dec. 17, 2021	Sep. 24, 2021	Jun. 25, 2021	Mar. 26, 2021	Jan. 02, 2021	Dec. 18, 2020	Sep. 25, 2020	Jun. 30, 2020	Dec. 20, 2019	Jul. 10, 2019	Dec. 31, 2021	Jan. 31, 2020	Dec. 31, 2012	Dec. 31, 2021	Jan. 01, 2021	Dec. 27, 2019	Jul. 30, 2002
Equity, Class of Treasury Stock [Line Items]
Number of shares available for future issuance under the plans															1,162,406			1,162,406
Stock repurchase authorized															$ 167,200,000			$ 167,200,000			$ 5,000,000.0
Additional stock repurchase authorized																		162,200,000
Amount available under repurchase plan															11,200,000			11,200,000
Cumulative purchases															$ 155,900,000			155,900,000
Total cost																		13,040,000	$ 2,367,000	$ 5,283,000
Cumulative cash used to repurchase of stock																		$ 34,605,000	$ 4,508,000	$ 7,807,000
Dividend declared															$ 0.44		$ 0.10	$ 0.40	$ 0.38	$ 0.36
Dividends payable, date of record					Dec. 17, 2021	Sep. 24, 2021	Jun. 25, 2021	Mar. 26, 2021		Dec. 18, 2020	Sep. 25, 2020	Jun. 30, 2020	Dec. 20, 2019	Jul. 10, 2019
Dividend payment					$ 12,900,000	$ 12,900,000	$ 12,900,000	$ 12,900,000		$ 9,100,000	$ 9,100,000	$ 9,100,000	$ 11,200,000	$ 11,200,000		$ 5,800,000		$ 12,885,000	$ 9,147,000	$ 11,567,000
Dividend payable, year					2021	2021	2021	2021		2020	2020	2020
Percentage of dividend									10.00%
First Quarter [Member]
Equity, Class of Treasury Stock [Line Items]
Dividend declared									$ 0.11
Forecast [Member]
Equity, Class of Treasury Stock [Line Items]
Dividends payable, date of record		Mar. 25, 2022
Dividend payment date	Apr. 08, 2022
Dividend payable, year	2022	2022
Director [Member]
Equity, Class of Treasury Stock [Line Items]
Repurchase of common stock																		24,000
Purchase price per share																		$ 16.05
Total cost																		$ 400,000
Share Repurchase Plan [Member]
Equity, Class of Treasury Stock [Line Items]
Repurchase of common stock																		749,000	184,000
Purchase price per share																		$ 17.42	$ 12.84
Total cost																		$ 13,000,000.0	$ 2,400,000
Cumulative [Member]
Equity, Class of Treasury Stock [Line Items]
Repurchase of common stock																		28,300,000	27,600,000
Purchase price per share																		$ 5.51	$ 5.19
Tax Withholding [Member]
Equity, Class of Treasury Stock [Line Items]
Shares withheld and not issued																		1,100,000	139,000
Cost of shares withheld and not issued																		$ 21,600,000	$ 2,100,000
Subsequent Event [Member]
Equity, Class of Treasury Stock [Line Items]
Dividend declared				$ 0.44
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															32,069			32,069
Shares issued under ESPP																		41,504	56,679	51,548
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			279,606
Stock Option [Member] \| Subsequent Event [Member]
Equity, Class of Treasury Stock [Line Items]
Additional shares authorized			250,000