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Stock-Based Compensation (Details) $ / shares in Units, $ in Thousands		3 Months Ended		12 Months Ended
		Mar. 31, 2021 USD ($) tranch stock_awards $ / shares shares	Mar. 31, 2020 USD ($) stock_awards shares	Dec. 31, 2020 $ / shares shares
Stock-Based Compensation [Abstract]
Number of types of stock-based awards granted (in types) | stock_awards		2	2
Fair market value of awards | $		$ 9,200	$ 11,100
Stock-based compensation expense | $		2,092	1,674
Tax benefit from compensation expense | $		500	400
Unrecognized compensation expense | $		$ 18,900
Unrecognized compensation, period for recognition		2 years 3 months 18 days
Performance Shares [Member]
Stock-Based Compensation [Abstract]
Stock-based compensation expense | $		$ 1,089	$ 610
Number of shares [Abstract]
Outstanding, December 31, 2020 | shares		196,340
Granted | shares		73,265	94,850
Performance condition adjustment (a) | shares	[1]	94,850
Vested | shares		(68,223)
Forfeited | shares		(11,775)
Outstanding, March 31, 2021 | shares		284,457		196,340
Weighted Average Grant Date Fair Value [Abstract]
Outstanding, December 31, 2020 | $ / shares		$ 35.34
Granted | $ / shares		52.45
Performance condition adjustment (a) | $ / shares	[1]	36.45
Vested | $ / shares		38.70
Forfeited | $ / shares		34.89
Outstanding, March 31, 2021 | $ / shares		$ 39.33		$ 35.34
Restricted Stock Units (RSUs) [Member]
Stock-Based Compensation [Abstract]
Stock-based compensation expense | $		$ 1,003	$ 1,064
Number of shares [Abstract]
Outstanding, December 31, 2020 | shares		212,766
Granted | shares		96,622	125,716
Performance condition adjustment (a) | shares		0
Vested | shares		(106,200)
Forfeited | shares		(7,398)
Outstanding, March 31, 2021 | shares		195,790		212,766
Weighted Average Grant Date Fair Value [Abstract]
Outstanding, December 31, 2020 | $ / shares		$ 34.24
Granted | $ / shares		52.45
Performance condition adjustment (a) | $ / shares		0
Vested | $ / shares		35.64
Forfeited | $ / shares		33.79
Outstanding, March 31, 2021 | $ / shares		$ 42.48		$ 34.24
Officer [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]
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%
Number of equal tranches for annual vesting (in tranches) | tranch		3
Weighted Average Grant Date Fair Value [Abstract]
Performance Shares Target Percentage Earned, Other Employees				200.00%
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
Nonemployee Directors [Member] | Restricted Stock Units (RSUs) [Member]
Stock-Based Compensation [Abstract]
Vesting period (in years)		1 year
[1] Represents additional PSUs granted during the three months ended March 31, 2021, related to the 2020 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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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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