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Stockholders' Equity (Narrative) (Details)								3 Months Ended												12 Months Ended
	Feb. 23, 2023 shares	Feb. 22, 2023 shares	Sep. 27, 2022 shares	Feb. 23, 2022 shares	Feb. 19, 2022 USD ($) shares	Feb. 17, 2021 shares	Feb. 19, 2020 USD ($) shares	Dec. 31, 2023 USD ($) plan $ / shares shares	Sep. 30, 2023 USD ($) $ / shares	Jun. 30, 2023 USD ($) $ / shares	Mar. 31, 2023 USD ($) $ / shares	Dec. 31, 2022 USD ($) $ / shares shares	Sep. 30, 2022 USD ($) $ / shares	Jun. 30, 2022 USD ($) $ / shares	Mar. 31, 2022 USD ($) $ / shares	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2026 shares	Dec. 31, 2023 USD ($) plan $ / shares shares	Dec. 31, 2022 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares authorized (in shares) | shares								80,000,000				80,000,000									80,000,000	80,000,000
Common stock, par value (in dollars per share) | $ / shares								$ 0.01				$ 0.01									$ 0.01	$ 0.01
Common stock, shares issued (in shares) | shares								26,627,319				26,359,876									26,627,319	26,359,876
Treasury stock, shares (in shares) | shares								11,627,818													11,627,818
Stock options awarded (in shares) | shares																					214,000
Grants, weighted average exercise price (in usd per share) | $ / shares																					$ 11.46
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number | shares								185,000													185,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period | shares																					90,000
Unrecognized share based compensation cost								$ 4,700,000													$ 4,700,000
Unrecognized share based compensation, expected term (in years)																					2 years 2 months 12 days
Issuance of common stock from employee stock purchase plan (in shares) | shares																					63,372	52,053	61,904
Weighted average purchase price of ESPP shares purchased during the period (in dollars per share) | $ / shares																					$ 23.58	$ 32.38	$ 26.32
Dividends declared per share (in dollars per share) | $ / shares								$ 0.1125	$ 0.1125	$ 0.1125	$ 0.1125										$ 0.4500	$ 0.4500	$ 0.4125
Dividends declared, common stock, amount								$ 1,685,000	$ 1,683,000	$ 1,679,000	$ 1,661,000	$ 1,655,000	$ 1,653,000	$ 1,730,000	$ 1,725,000
Common Stock, Dividends, Per Share, Cash Paid | $ / shares												$ 0.1125	$ 0.1125	$ 0.1125	$ 0.1125
Number of Stock Benefit Plans | plan								2													2
Exercise of stock options (in shares) | shares																					74,200	32,196	423,294
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Period Increase (Decrease) | shares																					56,957	18,797	211,088
Share-based Compensation Arrangement by Share-based Payment Award, Options, Returned for Payroll Taxes | shares																					5,486	2,895	43,534
Exercisable at end of year (in usd per share) | $ / shares								$ 30.38													$ 30.38
Exercised (in usd per share) | $ / shares																					$ 23.98	$ 25.49	$ 21.99
Common stock outstanding (in shares) | shares								14,999,501				14,732,058									14,999,501	14,732,058
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares																					$ 11.70
Canceled or expired (in usd per share) | $ / shares																					$ 13.59
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Nonvested, Number of Shares | shares								915,000				976,000									915,000	976,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | $ / shares								$ 12.77				$ 12.83									$ 12.77	$ 12.83
Grants, weighted average exercise price (in usd per share) | $ / shares																					$ 32.69
Good to Great Incentive Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options awarded (in shares) | shares					8,444		0															27,448
Total intrinsic value of options exercised					$ 276,000,000		$ 0															$ 1,358,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Grant Date Intrinsic Value | $ / shares																							$ 49.48
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual term of all options granted																					7 years
Stock options awarded (in shares) | shares	58,500	214,191	12,600	310,000		701,400															150,000
Total intrinsic value of options exercised																					$ 538,000	580,000	$ 8,229,000
Total fair value of stock options vested																					6,003,000	1,784,000	1,413,000
Unrecognized share based compensation cost								$ 9,000,000													$ 9,000,000
Unrecognized share based compensation, expected term (in years)																					3 years 9 months 18 days
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation																					$ 174,000	123,000	2,272,000
Proceeds from Stock Options Exercised																					0	60,000	1,013,000
Share based compensation expense																					$ 2,900,000	$ 2,300,000	$ 2,400,000
Dividend yield	0.91%	1.38%	1.43%	0.91%		1.15%															1.15%
Expected volatility	33.18%	43.68%	43.68%	34.35%		36.72%															34.08%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	1.89%	4.27%	4.29%	1.98%		0.57%															1.29%
Employee Stock Option | Black-Scholes
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options awarded (in shares) | shares																					0	0	150,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Options, Grants in Period, Aggregate Grant Date Market Value																					$ 0	$ 0	$ 1,684,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period | shares																					105,150	45,590	74,688
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures Fair Valueriod																					$ 1,380,000	$ 512,000	$ 722,000
Grants, weighted average exercise price (in usd per share) | $ / shares																					$ 32.69	$ 49.48	$ 34.79
Employee Stock Option | Monte-Carlo Pricing Model
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options awarded (in shares) | shares																						150,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Options, Grants in Period, Aggregate Grant Date Market Value																						$ 1,700,000
Grants, weighted average exercise price (in usd per share) | $ / shares																						$ 34.79
Employee Stock Option | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual term of all options granted																					10 years
Employee Stock Option | Maximum | Monte-Carlo Pricing Model
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Number Available To Vest | shares												100,000										100,000
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Vesting, Common Stock Price | $ / shares												$ 77.34										$ 77.34
Employee Stock Option | Minimum | Monte-Carlo Pricing Model
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Number Available To Vest | shares												50,000										50,000
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Vesting, Common Stock Price | $ / shares												$ 53.39										$ 53.39
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Purchase price percentage of grant date price per share (as a percent)																					85.00%
Share based compensation expense																					$ 600,000	$ 500,000	$ 600,000
Dividend yield																					1.30%	0.01%	0.01%
Expected volatility																					53.50%	30.20%	48.10%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate								472.00%	475.00%	477.00%	453.00%	40.00%	31.00%	22.00%	8.00%	10.00%	10.00%	9.00%	9.00%
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cancellations ( in usd per share) | $ / shares																					$ 33.48
Cancellations (in shares) | shares																					(1,826)
Awards (in shares) | shares																					142,020
Share based compensation expense																					$ 1,400,000	$ 200,000	$ 400,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | $ / shares								$ 32.65				$ 31.05									$ 32.65	$ 31.05
Awards ( in usd per share) | $ / shares																					$ 32.63
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards (in shares) | shares																					142,020	0	9,300
Awards granted, aggregate grant date market value																					$ 4,634,000	$ 0	$ 324,000
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation | shares																					1,473	4,136	10,399
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation																					$ 50,000	$ 205,000	$ 375,000
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Forfeited In Period, Fair Value																					$ 61,000	$ 63,000	$ 27,000
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited | shares																					1,826	1,950	966
Awards ( in usd per share) | $ / shares																						$ 32.63	$ 34.79
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cancellations ( in usd per share) | $ / shares																					$ 28.85
Cancellations (in shares) | shares																					(54,229)	(30,743)	(55,896)
Unrecognized share based compensation cost								$ 2,300,000													$ 2,300,000
Unrecognized share based compensation, expected term (in years)																					12 months
Awards (in shares) | shares																					0	27,013	55,302
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Granted In Period, Fair Value																					$ 0	$ 1,262,000	$ 2,116,000
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Forfeited In Period, Fair Value																					$ 1,565,000	$ 295,000	799,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | $ / shares								$ 19.81				$ 20.95									$ 19.81	$ 20.95
Performance Shares | Forecast
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards (in shares) | shares																				892,045
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards (in shares) | shares																					30,000
Awards granted, aggregate grant date market value																					$ 826,000
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation | shares																					1,001
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation																					$ 28,000
Share based compensation expense																					$ 800,000
Grants, weighted average exercise price (in usd per share) | $ / shares																					$ 27.54
Officers And Key Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Directors compensation expense																					$ 1,600,000	$ 2,500,000	1,600,000
Board of Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Directors compensation expense																					$ 800,000	$ 700,000	$ 900,000
Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options awarded (in shares) | shares																					15,059	11,155	14,744
Value of stock options granted																					$ 431,000	$ 415,000	$ 622,000
Cancellations ( in usd per share) | $ / shares																					$ 28.60	$ 37.14	$ 42.14
Director Compensation, Quarterly Installment Of Annual Cash Retainer					35,000
Share Based Compensation Arrangement By Share Based Payment Award, Admission Grant					25,000
Share Based Compensation Arrangement By Share Based Payment Award, Quarterly Retainer					18,750
Advsior
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options awarded (in shares) | shares																					691	555	466
Value of stock options granted																					$ 20,000	$ 20,000	$ 20,000
Lead Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Director Compensation, Quarterly Installment Of Annual Cash Retainer					2,500
Share Based Compensation Arrangement By Share Based Payment Award, Additional Installment of Annual Cash Retainer					10,000
Chairman of Audit Committee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Director Compensation, Quarterly Installment Of Annual Cash Retainer					2,500
Share Based Compensation Arrangement By Share Based Payment Award, Additional Installment of Annual Cash Retainer					10,000
Chairman of Corporate Governance
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Director Compensation, Quarterly Installment Of Annual Cash Retainer					1,250
Share Based Compensation Arrangement By Share Based Payment Award, Additional Installment of Annual Cash Retainer					5,000
Chairman of Compensation Commitee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Director Compensation, Quarterly Installment Of Annual Cash Retainer					1,250
Share Based Compensation Arrangement By Share Based Payment Award, Additional Installment of Annual Cash Retainer					$ 5,000
Seven Year Vesting Period | Employee Stock Option | Black-Scholes
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options awarded (in shares) | shares																					0	310,000	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Options, Grants in Period, Aggregate Grant Date Market Value																					$ 0	$ 5,388,000	$ 0
Three Year Vesting Period | Employee Stock Option | Black-Scholes
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options awarded (in shares) | shares																					0	12,600	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Options, Grants in Period, Aggregate Grant Date Market Value																					$ 0	$ 143,000	$ 0
Grants, weighted average exercise price (in usd per share) | $ / shares																					$ 31.58
Five Year Vesting Period | Employee Stock Option | Black-Scholes
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options awarded (in shares) | shares																					214,191	58,500	701,400
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Options, Grants in Period, Aggregate Grant Date Market Value																					$ 2,506,000	$ 959,000	$ 7,115,000

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