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Long-Term Incentive Compensation Plans:PSU and RSU Awards (Details) $ / shares in Units, $ in Thousands		12 Months Ended
		Dec. 31, 2019 USD ($) tranch $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares
Stock-Based Compensation [Abstract]
Fair market value of PSUs and RSUs vested | $		$ 11,400	$ 15,400	$ 8,500
Share-based Compensation Expense | $		7,973	8,831	9,730
Tax benefit from compensation expense | $		2,000	$ 2,200	$ 2,500
Unrecognized compensation expense | $		$ 7,300
Unrecognized Compensation, Period for Recognition		1 year 8 months 12 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			100.00%	135.00%
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			110.00%	145.00%
Number of equal tranches for annual vesting (in tranches) | tranch		3
Performance Shares [Member]
Stock-Based Compensation [Abstract]
Share-based Compensation Expense | $		$ 3,340	$ 4,005	$ 4,923
Number of shares [Abstract]
Outstanding, December 31, 2018 | shares		429,788
Granted | shares		110,923	78,976	178,021
Performance condition adjustment | shares	[1]	1,443
Vested | shares		(223,840)
Forfeited | shares		(22,967)
Outstanding, December 31, 2019 | shares		295,347	429,788
Weighted Average Grant Date Fair Value [Abstract]
Outstanding, December 31, 2018 | $ / shares		$ 25.90
Granted | $ / shares		29.48	$ 43.05	$ 27.05
Performance condition adjustment | $ / shares	[1]	43.05
Vested | $ / shares		19.97
Forfeited | $ / shares		35.26
Outstanding, December 31, 2019 | $ / shares		$ 31.09	$ 25.90
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 | $		$ 4,633	$ 4,826	$ 4,807
Number of shares [Abstract]
Outstanding, December 31, 2018 | shares		289,173
Granted | shares		167,861	99,087	214,035
Performance condition adjustment | shares		0
Vested | shares		(183,403)
Forfeited | shares		(16,067)
Outstanding, December 31, 2019 | shares		257,564	289,173
Weighted Average Grant Date Fair Value [Abstract]
Outstanding, December 31, 2018 | $ / shares		$ 29.52
Granted | $ / shares		29.13	$ 43.08	$ 27.10
Performance condition adjustment | $ / shares		0
Vested | $ / shares		26.44
Forfeited | $ / shares		34.65
Outstanding, December 31, 2019 | $ / shares		$ 31.14	$ 29.52
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 to non-officers based on achievement of 2018 EBITDA in excess of target.

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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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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.

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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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