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Stock-Based Compensation (Details) $ / shares in Units, $ in Thousands		3 Months Ended				6 Months Ended		12 Months Ended
		Jun. 30, 2021 USD ($) $ / shares shares	Mar. 31, 2021 stock_awards $ / shares shares	Jun. 30, 2020 USD ($)	Mar. 31, 2020 stock_awards	Jun. 30, 2021 USD ($) tranch $ / shares shares	Jun. 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 | $		$ 1,411		$ 1,671		3,503	3,345
Tax benefit from compensation expense | $						900	800
Unrecognized compensation expense | $		14,900				$ 14,900
Unrecognized compensation, period for recognition						2 years 1 month 6 days
Performance Shares [Member]
Stock-Based Compensation [Abstract]
Stock-based compensation expense | $		$ 745		691		$ 1,834	$ 1,301
Number of shares [Abstract]
Outstanding, December 31, 2020 | shares			196,340			196,340
Granted | shares						73,265	94,850
Performance condition adjustment (a) | shares	[1]					94,850
Vested | shares						(68,223)
Forfeited | shares						(49,259)
Outstanding, June 30, 2021 | shares		246,973				246,973		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						37.19
Outstanding, June 30, 2021 | $ / shares		$ 39.54				$ 39.54		$ 35.34
Restricted Stock Units (RSUs) [Member]
Stock-Based Compensation [Abstract]
Stock-based compensation expense | $		$ 666		$ 980		$ 1,669	$ 2,044
Number of shares [Abstract]
Outstanding, December 31, 2020 | shares			212,766			212,766
Granted | shares						99,588	125,716
Performance condition adjustment (a) | shares						0
Vested | shares						(106,200)
Forfeited | shares						(45,562)
Outstanding, June 30, 2021 | shares		160,592				160,592		212,766
Weighted Average Grant Date Fair Value [Abstract]
Outstanding, December 31, 2020 | $ / shares			$ 34.24			$ 34.24
Granted | $ / shares						52.96
Performance condition adjustment (a) | $ / shares						0
Vested | $ / shares						35.64
Forfeited | $ / shares						33.76
Outstanding, June 30, 2021 | $ / shares		$ 45.06				$ 45.06		$ 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%
Performance Shares Target Percentage Earned, Other Employees								200.00%
Number of equal tranches for annual vesting (in tranches) | tranch						3
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 six months ended June 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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