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Stockholders' Equity:AOCI (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Beginning balance, net of taxes |  |  |  | $ 674,549 |
Net actuarial gain (loss), before taxes |  | $ (3,874) | $ 0 | 9,466 | $ 0
Amortization of actuarial loss, before taxes (a) | [1] | 151 | 441 | 1,328 | 1,245
Effect of settlements, before taxes (a) | [1] | 11,252 | 0 | 23,255 | 0
Income taxes |  | (1,909) | (170) | (8,634) | (479)
Ending balance, net of taxes |  | 747,762 |  | 747,762 |
Accumulated Other Comprehensive Loss [Member] |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Beginning balance, net of taxes |  | (56,907) | (82,517) | (76,702) | (83,012)
Ending balance, net of taxes |  | $ (51,287) | $ (82,246) | $ (51,287) | $ (82,246)
[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 9, Retirement and Benefit Plans.

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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