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Long-Term Incentive Compensation Plans:PSU and RSU Awards (Details) $ / shares in Units, $ in Thousands		12 Months Ended
		Dec. 31, 2020 USD ($) tranch $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares
Stock-Based Compensation [Abstract]
Fair market value of PSUs and RSUs vested | $		$ 11,100	$ 11,400	$ 15,400
Share-based Compensation Expense | $		7,820	7,973	8,831
Tax benefit from compensation expense | $		2,000	$ 2,000	$ 2,200
Unrecognized compensation expense | $		$ 9,200
Unrecognized Compensation, Period for Recognition		1 year 10 months 24 days
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			93.00%	100.00%
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			96.00%	110.00%
Number of equal tranches for annual vesting (in tranches) | tranch		3
Performance Shares [Member]
Stock-Based Compensation [Abstract]
Share-based Compensation Expense | $		$ 3,795	$ 3,340	$ 4,005
Number of shares [Abstract]
Outstanding, December 31, 2019 | shares		295,347
Granted | shares		94,850	110,923	78,976
Performance condition adjustment | shares	[1]	(6,989)
Vested | shares		(162,622)
Forfeited | shares		(24,246)
Outstanding, December 31, 2020 | shares		196,340	295,347
Weighted Average Grant Date Fair Value [Abstract]
Outstanding, December 31, 2019 | $ / shares		$ 31.09
Granted | $ / shares		36.45	$ 29.48	$ 43.05
Performance condition adjustment | $ / shares	[1]	29.48
Vested | $ / shares		28.93
Forfeited | $ / shares		32.57
Outstanding, December 31, 2020 | $ / shares		$ 35.34	$ 31.09
Performance Shares [Member] | Officer [Member]
Stock-Based Compensation [Abstract]
Vesting period (in years)		3 years
Performance Shares [Member] | Other employees [Member]
Stock-Based Compensation [Abstract]
Number of equal tranches for annual vesting (in tranches) | tranch		3
Restricted Stock Units (RSUs) [Member]
Stock-Based Compensation [Abstract]
Share-based Compensation Expense | $		$ 4,025	$ 4,633	$ 4,826
Number of shares [Abstract]
Outstanding, December 31, 2019 | shares		257,564
Granted | shares		125,716	167,861	99,087
Performance condition adjustment | shares	[1]	0
Vested | shares		(143,807)
Forfeited | shares		(26,707)
Outstanding, December 31, 2020 | shares		212,766	257,564
Weighted Average Grant Date Fair Value [Abstract]
Outstanding, December 31, 2019 | $ / shares		$ 31.14
Granted | $ / shares		36.45	$ 29.13	$ 43.08
Performance condition adjustment | $ / shares	[1]	0
Vested | $ / shares		30.88
Forfeited | $ / shares		32.82
Outstanding, December 31, 2020 | $ / shares		$ 34.24	$ 31.14
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 total PSUs forfeited during the year ended December 31, 2020, related to the 2019 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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