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Long-Term Incentive Compensation Plans:PSU and RSU Awards (Details) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2021 USD ($) tranch $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares
Stock-Based Compensation [Abstract] |  |  |  |
Fair market value of PSUs and RSUs vested | $ |  | $ 9,200 | $ 11,100 | $ 11,400
Share-based Compensation Expense | $ |  | 7,911 | 7,820 | 7,973
Tax benefit from compensation expense | $ |  | 2,000 | 2,000 | 2,000
Unrecognized compensation expense | $ |  | $ 10,400 |  |
Unrecognized Compensation, Period for Recognition |  | 1 year 9 months 18 days |  |
Performance Shares [Member] |  |  |  |
Stock-Based Compensation [Abstract] |  |  |  |
Share-based Compensation Expense | $ |  | $ 4,240 | $ 3,795 | $ 3,340
Number of shares [Abstract] |  |  |  |
Outstanding, December 31, 2020 |  | 196,340 |  |
Granted |  | 73,265 |  |
Performance condition adjustment | [1] | 94,850 |  |
Vested |  | (68,223) |  |
Forfeited |  | (50,022) |  |
Outstanding, December 31, 2021 |  | 246,210 | 196,340 |
Weighted Average Grant Date Fair Value [Abstract] |  |  |  |
Outstanding, December 31, 2020 | $ / shares |  | $ 35.34 |  |
Granted | $ / shares |  | 52.45 | $ 36.45 | $ 29.48
Performance condition adjustment | $ / shares | [1] | 36.45 |  |
Vested | $ / shares |  | 38.70 |  |
Forfeited | $ / shares |  | 37.43 |  |
Outstanding, December 31, 2021 | $ / shares |  | $ 39.50 | $ 35.34 |
Performance Shares [Member] | 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, ROIC |  |  | 200.00% | 93.00%
Vesting period (in years) |  | 3 years |  |
Performance Shares [Member] | Other employees [Member] |  |  |  |
Stock-Based Compensation [Abstract] |  |  |  |
Performance Shares that could be awarded, as a percentage of target amount, minimum |  | 0.00% |  |
Performance Shares that could be awarded, as a percentage of target amount, maximum |  | 200.00% |  |
Performance Shares Target Percentage Earned, EBITDA |  |  | 200.00% | 96.00%
Number of equal tranches for annual vesting (in tranches) | tranch |  | 3 |  |
Performance Shares [Member] | Officers and other employees [Member] |  |  |  |
Number of shares [Abstract] |  |  |  |
Granted |  | 73,265 | 94,850 | 110,923
Restricted Stock Units (RSUs) [Member] |  |  |  |
Stock-Based Compensation [Abstract] |  |  |  |
Share-based Compensation Expense | $ |  | $ 3,671 | $ 4,025 | $ 4,633
Number of shares [Abstract] |  |  |  |
Outstanding, December 31, 2020 |  | 212,766 |  |
Granted |  | 101,059 | 125,716 | 167,861
Performance condition adjustment |  | 0 |  |
Vested |  | (106,200) |  |
Forfeited |  | (46,325) |  |
Outstanding, December 31, 2021 |  | 161,300 | 212,766 |
Weighted Average Grant Date Fair Value [Abstract] |  |  |  |
Outstanding, December 31, 2020 | $ / shares |  | $ 34.24 |  |
Granted | $ / shares |  | 52.95 | $ 36.45 | $ 29.13
Performance condition adjustment | $ / shares |  | 0 |  |
Vested | $ / shares |  | 35.64 |  |
Forfeited | $ / shares |  | 34.07 |  |
Outstanding, December 31, 2021 | $ / shares |  | $ 45.08 | $ 34.24 |
Restricted Stock Units (RSUs) [Member] | Officers and other employees [Member] |  |  |  |
Stock-Based Compensation [Abstract] |  |  |  |
Number of equal tranches for annual vesting (in tranches) | tranch |  | 3 |  |
Restricted Stock Units (RSUs) [Member] | Nonemployee Directors [Member] |  |  |  |
Stock-Based Compensation [Abstract] |  |  |  |
Vesting period (in years) |  | 1 year |  |
[1] | Represents additional PSUs granted during the year ended December 31, 2021, related to the 2020 performance condition adjustment described above.

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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 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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- Definition 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. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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