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Stock-Based Compensation (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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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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- Definition The performance shares awarded to participants during the period as a percentage of the target based on the entity's EBITDA, determined in accordance with the grant agreement. + References No definition available. + Details
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- Definition The percentage of the target amount of performance shares percentage awarded, based on the entity's return on invested capital (ROIC), determined in accordance with the grant agreement. + References No definition available. + Details
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- Definition The maximum percentage of the target amount of performance shares that may be awarded, based on the entity's return on invested capital (ROIC), determined in accordance with the grant agreement. + References No definition available. + Details
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- Definition The weighted average fair value of non-vested performance true-up awards on equity-based plans excluding options plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + References No definition available. + Details
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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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