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Stock-Based Compensation (Details) $ / shares in Units, $ in Thousands		3 Months Ended			6 Months Ended
		Jun. 30, 2022 USD ($) $ / shares shares	Mar. 31, 2022 $ / shares shares	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) tranch stock_awards $ / shares shares	Jun. 30, 2021 USD ($) stock_awards 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 | $		$ 3,012		$ 1,411	5,403	3,503
Tax benefit from compensation expense | $					1,300	900
Unrecognized compensation expense | $		18,800			$ 18,800
Unrecognized compensation, period for recognition					2 years
Performance Shares [Member]
Stock-Based Compensation [Abstract]
Stock-based compensation expense | $		$ 1,695		745	$ 3,001	1,834
Number of shares [Abstract]
Outstanding, December 31, 2021			246,210		246,210
Granted					66,180
Performance condition adjustment (a)	[1]				64,399
Vested					(58,935)
Forfeited					0
Outstanding, June 30, 2022		317,854			317,854
Weighted Average Grant Date Fair Value [Abstract]
Outstanding, December 31, 2021 | $ / shares			$ 39.50		$ 39.50
Granted | $ / shares					79.81
Performance condition adjustment (a) | $ / shares	[1]				52.45
Vested | $ / shares					34.41
Forfeited | $ / shares					0
Outstanding, June 30, 2022 | $ / shares		$ 51.46			$ 51.46
Restricted Stock Units (RSUs) [Member]
Stock-Based Compensation [Abstract]
Stock-based compensation expense | $		$ 1,317		$ 666	$ 2,402	$ 1,669
Number of shares [Abstract]
Outstanding, December 31, 2021			161,300		161,300
Granted					86,164
Performance condition adjustment (a)					0
Vested					(91,594)
Forfeited					(1,236)
Outstanding, June 30, 2022		154,634			154,634
Weighted Average Grant Date Fair Value [Abstract]
Outstanding, December 31, 2021 | $ / shares			$ 45.08		$ 45.08
Granted | $ / shares					80.00
Performance condition adjustment (a) | $ / shares					0
Vested | $ / shares					43.58
Forfeited | $ / shares					79.83
Outstanding, June 30, 2022 | $ / shares		$ 65.15			$ 65.15
Officers and Other Employees and Nonemployment directors | Restricted Stock Units (RSUs) [Member]
Number of shares [Abstract]
Granted					86,164	99,588
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 six months ended June 30, 2022, related to the 2021 performance condition adjustment 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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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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