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Stockholders' Equity:AOCI (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Beginning Balance, net of taxes |  | $ 850,799 | $ 701,330 |  | $ 672,590
Net actuarial gain (loss), before taxes |  | 61 | 6,832 |  | (4,642)
Amortization of actuarial (gain) loss, before taxes | [1] | (19) | 807 |  | (175)
Effect of settlements, before taxes | [1] | 0 | 6,250 |  | 1,342
Income taxes |  | (11) | 35,281 | [2] | 879
Ending Balance, net of taxes |  | 1,352,619 | 850,799 |  | 701,330
Stranded tax effects of Plan Termination |  | 0 | 38,794 | [3] | 0
Accumulated Other Comprehensive Loss [Member] |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Beginning Balance, net of taxes |  | (1,078) | (50,248) |  | (47,652)
Ending Balance, net of taxes |  | $ (1,047) | $ (1,078) |  | $ (50,248)
[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 11, Retirement and Benefit Plans.
[2] | For the year ended December 31, 2020, income taxes included $38.8 million related to the release of stranded tax effects upon Plan Termination, as discussed in Note 4, Income Taxes
[3] | In December 2020, we eliminated our qualified defined benefit pension plan (Plan Termination), as discussed in Note 11, Retirement and Benefit Plans. Prior to the Plan Termination, "Accumulated other comprehensive loss" on our Consolidated Balance Sheet included the stranded tax effects of our conversion from a limited liability company to a corporation in 2013 and the adoption of the Tax Cuts and Jobs Act (the "Tax Act") in 2017. Upon Plan Termination, these stranded tax effects of $38.8 million were required to be released into income tax expense under GAAP.

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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=124509347&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=124509347&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=123447040&loc=d3e1928-114920 + Details
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