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Stockholders' Equity:AOCI (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance, net of taxes				$ 674,549
Net actuarial gain, before taxes		$ 13,340	$ 0	13,340	$ 0
Amortization of actuarial loss, before taxes (a)	[1]	356	410	1,177	805
Effect of settlements, before taxes (a)	[1]	12,003	0	12,003	0
Income taxes		(6,517)	(158)	(6,725)	(310)
Ending balance, net of taxes		768,188		768,188
Accumulated Other Comprehensive Loss [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance, net of taxes		(76,089)	(82,769)	(76,702)	(83,012)
Ending balance, net of taxes		$ (56,907)	$ (82,517)	$ (56,907)	$ (82,517)
[1] Represents amounts reclassified from accumulated other comprehensive loss. These amounts are included in the computation of net periodic pension cost. For additional information, see Note 8, Retirement and Benefit Plans.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount, before tax, of increase (decrease) to other comprehensive income from settlement and curtailment gain (loss) of defined benefit plan.

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Amount, before tax, of gain (loss) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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Amount, before tax, of reclassification adjustment from accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan.

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Amount of tax expense (benefit) allocated to other comprehensive income (loss) attributable to parent entity.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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