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Long-Term Incentive Compensation Plans:PSU and RSU Awards (Details) $ / shares in Units, $ in Thousands		12 Months Ended
		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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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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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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