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Stock-Based Compensation (Details) $ / shares in Units, $ in Thousands		3 Months Ended				6 Months Ended	9 Months Ended
		Sep. 30, 2022 USD ($) $ / shares shares	Mar. 31, 2022 stock_awards $ / shares shares	Sep. 30, 2021 USD ($)	Mar. 31, 2021 stock_awards	Jun. 30, 2022 $ / shares shares	Sep. 30, 2022 USD ($) tranch $ / shares shares	Sep. 30, 2021 USD ($) shares
Stock-Based Compensation [Abstract]
Number of types of stock-based awards granted (in types) | stock_awards			2		2
Fair market value of awards | $							$ 12,000	$ 9,200
Stock-based compensation expense | $		$ 3,287		$ 2,181			8,690	5,684
Tax benefit from compensation expense | $							2,200	1,400
Unrecognized compensation expense | $		16,900					$ 16,900
Unrecognized compensation, period for recognition							1 year 10 months 24 days
Performance Shares [Member]
Stock-Based Compensation [Abstract]
Stock-based compensation expense | $		$ 1,933		1,190			$ 4,934	3,024
Number of shares [Abstract]
Outstanding, December 31, 2021			246,210			246,210	246,210
Granted							66,180
Performance condition adjustment (a)	[1]						64,399
Vested							(58,935)
Forfeited							0
Outstanding, September 30, 2022		317,854					317,854
Weighted Average Grant Date Fair Value [Abstract]
Outstanding, December 31, 2021 | $ / shares			$ 39.50			$ 39.50	$ 39.50
Granted | $ / shares							79.81
Performance condition adjustment (a) | $ / shares	[1]						52.45
Vested | $ / shares							34.41
Forfeited | $ / shares							0
Outstanding, September 30, 2022 | $ / shares		$ 51.46					$ 51.46
Restricted Stock Units (RSUs) [Member]
Stock-Based Compensation [Abstract]
Stock-based compensation expense | $		$ 1,354		$ 991			$ 3,756	$ 2,660
Number of shares [Abstract]
Outstanding, December 31, 2021			161,300			161,300	161,300
Granted							86,869
Performance condition adjustment (a)							0
Vested							(91,594)
Forfeited							(1,236)
Outstanding, September 30, 2022		155,339					155,339
Weighted Average Grant Date Fair Value [Abstract]
Outstanding, December 31, 2021 | $ / shares			$ 45.08			$ 45.08	$ 45.08
Granted | $ / shares							79.92
Performance condition adjustment (a) | $ / shares							0
Vested | $ / shares							43.58
Forfeited | $ / shares							79.83
Outstanding, September 30, 2022 | $ / shares		$ 65.17					$ 65.17
Officers and Other Employees and Nonemployment directors | Restricted Stock Units (RSUs) [Member]
Number of shares [Abstract]
Granted							86,869	101,059
Nonemployee Directors [Member] | Restricted Stock Units (RSUs) [Member]
Stock-Based Compensation [Abstract]
Vesting period (in years)							1 year
Officers and other employees [Member] | Performance Shares [Member]
Number of shares [Abstract]
Granted							66,180	73,265
Officers and other employees [Member] | Restricted Stock Units (RSUs) [Member]
Stock-Based Compensation [Abstract]
Number of equal tranches for annual vesting (in tranches) | tranch							3
Officer [Member] | Performance Shares [Member]
Stock-Based Compensation [Abstract]
Performance Shares that could be awarded, as a percentage of ROIC target amount, minimum							0.00%
Performance Shares that could be awarded, as a percentage of ROIC target amount, maximum							200.00%
Performance Shares Target Percentage Earned, Officers						200.00%
Vesting period (in years)							3 years
Other employees [Member] | Performance Shares [Member]
Stock-Based Compensation [Abstract]
Performance Shares that could be awarded, as a percentage of EBITDA target amount, minimum							0.00%
Performance Shares that could be awarded, as a percentage of EBITDA target amount, maximum							200.00%
Performance Shares Target Percentage Earned, Other Employees						200.00%
Number of equal tranches for annual vesting (in tranches) | tranch							3
[1] Represents additional PSUs granted during the nine months ended September 30, 2022, related to above-target achievement of the 2021 performance condition described above.

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The company's EBITDA exceed the performance target, thus participants earned a true-up related to their performance stock unit shares.

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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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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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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