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Stock-Based Compensation (Details) $ / shares in Units, $ in Thousands		3 Months Ended				9 Months Ended		12 Months Ended
		Sep. 30, 2021 USD ($) $ / shares shares	Mar. 31, 2021 stock_awards $ / shares shares	Sep. 30, 2020 USD ($)	Mar. 31, 2020 stock_awards	Sep. 30, 2021 USD ($) tranch $ / shares shares	Sep. 30, 2020 USD ($) 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 | $		$ 2,181		$ 2,494		5,684	5,839
Tax benefit from compensation expense | $						1,400	1,500
Unrecognized compensation expense | $		12,700				$ 12,700
Unrecognized compensation, period for recognition						1 year 10 months 24 days
Performance Shares [Member]
Stock-Based Compensation [Abstract]
Stock-based compensation expense | $		$ 1,190		1,503		$ 3,024	2,804
Number of shares [Abstract]
Outstanding, December 31, 2020			196,340			196,340
Granted						73,265
Performance condition adjustment (a)	[1]					94,850
Vested						(68,223)
Forfeited						(50,022)
Outstanding, September 30, 2021		246,210				246,210		196,340
Weighted Average Grant Date Fair Value [Abstract]
Outstanding, December 31, 2020 | $ / shares			$ 35.34			$ 35.34
Granted | $ / shares						52.45
Performance condition adjustment (a) | $ / shares	[1]					36.45
Vested | $ / shares						38.70
Forfeited | $ / shares						37.43
Outstanding, September 30, 2021 | $ / shares		$ 39.50				$ 39.50		$ 35.34
Restricted Stock Units (RSUs) [Member]
Stock-Based Compensation [Abstract]
Stock-based compensation expense | $		$ 991		$ 991		$ 2,660	$ 3,035
Number of shares [Abstract]
Outstanding, December 31, 2020			212,766			212,766
Granted						101,059
Performance condition adjustment (a)						0
Vested						(106,200)
Forfeited						(46,325)
Outstanding, September 30, 2021		161,300				161,300		212,766
Weighted Average Grant Date Fair Value [Abstract]
Outstanding, December 31, 2020 | $ / shares			$ 34.24			$ 34.24
Granted | $ / shares						52.95
Performance condition adjustment (a) | $ / shares						0
Vested | $ / shares						35.64
Forfeited | $ / shares						34.07
Outstanding, September 30, 2021 | $ / shares		$ 45.08				$ 45.08		$ 34.24
Officers and Other Employees and Nonemployment directors | Restricted Stock Units (RSUs) [Member]
Number of shares [Abstract]
Granted						101,059	125,716
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						73,265	94,850
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, 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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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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