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Stockholders' Equity | 12 Months Ended
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Dec. 31, 2022
Equity [Abstract] |
Stockholders' equity | Note 13 – Stockholders’ equity: Long-term incentive compensation plan – Prior to 2020, our board of directors adopted a plan that provides for the award of stock to our board of directors, up to a maximum of 200,000 shares. We awarded 13,500 shares in 2020, 7,200 shares in 2021 and 8,400 shares in 2022 under this plan. At December 31, 2022, 111,800 shares are available for awards. Stock repurchase program – Prior to 2020, our board of directors authorized the repurchase of up to 2.0 million shares of our common stock in open market transactions, including block purchases, or in privately-negotiated transactions at unspecified prices and over an unspecified period of time. We may repurchase our common stock from time to time as market conditions permit. The stock repurchase program does not include specific price targets or timetables and may be suspended at any time. Depending on market conditions, we may terminate the program prior to its completion. We use cash on hand or other sources of liquidity to acquire the shares. Repurchased shares are added to our treasury and subsequently cancelled upon approval of the board of directors. In 2020, we acquired 122,489 shares of our common stock in market transactions for an aggregate purchase price of $1.0 million and subsequently cancelled all such shares. In 2021, we acquired 14,409 shares of common stock in market transactions for an aggregate purchase price of $.2 million and subsequently cancelled all such shares. In 2022, we acquired 217,778 shares of common stock in market transactions for an aggregate purchase price of $2.5 million. Of these shares, 73,881 were purchased in the first quarter and subsequently cancelled, and 143,897 shares were purchased in the fourth quarter and are accounted for as treasury stock at December 31, 2022. At December 31, 2022, 1,331,332 shares are available for repurchase under this stock repurchase program. Accumulated other comprehensive loss – Changes in accumulated other comprehensive loss for 2020, 2021 and 2022 are presented in the table below.
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years ended December 31,
​ |  | 2020 |  | 2021 |  | 2022
​ | ​ | (In millions)
Accumulated other comprehensive loss, net of tax: |  | ​ |  |  | ​ |  |  | ​ |
Currency translation: |  | ​ |  |  | ​ |  |  | ​ |
Balance at beginning of period | ​ | $ | (246.8) | ​ | $ | (233.4) | ​ | $ | (240.4)
Other comprehensive income (loss) | ​ |  | 13.4 | ​ |  | (7.0) | ​ |  | (28.8)
Balance at end of period | ​ | $ | (233.4) | ​ | $ | (240.4) | ​ | $ | (269.2)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Defined benefit pension plans: | ​ |  |  | ​ |  |  | ​ |  |
Balance at beginning of period | ​ | $ | (202.2) | ​ | $ | (214.5) | ​ | $ | (163.3)
Other comprehensive income - amortization of prior service cost and net losses included in net periodic pension cost | ​ |  | 13.4 | ​ |  | 14.9 | ​ |  | 9.9
Net actuarial gain (loss) arising during year | ​ | ​ | (25.7) | ​ | ​ | 36.3 | ​ | ​ | 90.3
Balance at end of period | ​ | $ | (214.5) | ​ | $ | (163.3) | ​ | $ | (63.1)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
OPEB plans: | ​ |  |  | ​ |  |  | ​ |  |
Balance at beginning of period | ​ | $ | .2 | ​ | $ | (.3) | ​ | $ | (.4)
Other comprehensive loss - amortization of prior service credit and net losses included in net periodic OPEB cost | ​ |  | (.2) | ​ |  | (.3) | ​ |  | (.3)
Net actuarial gain (loss) arising during year | ​ | ​ | (.3) | ​ | ​ | .2 | ​ | ​ | 1.5
Balance at end of period | ​ | $ | (.3) | ​ | $ | (.4) | ​ | $ | .8
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total accumulated other comprehensive loss: | ​ |  |  | ​ |  |  | ​ |  |
Balance at beginning of period | ​ | $ | (448.8) | ​ | $ | (448.2) | ​ | $ | (404.1)
Other comprehensive income | ​ |  | .6 | ​ |  | 44.1 | ​ |  | 72.6
Balance at end of period | ​ | $ | (448.2) | ​ | $ | (404.1) | ​ | $ | (331.5)
​ See Note 6 for further discussion on our marketable securities, Note 10 for amounts related to our defined benefit pension plans and Note 11 for our OPEB plans.

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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI https://asc.fasb.org/topic&trid=2208762 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496158-112644 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496158-112644 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 14 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496171-112644 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 14 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496171-112644 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI https://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 18 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496189-112644 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (g) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496158-112644 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 18 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496189-112644 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (h) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496158-112644 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 14 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496171-112644 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 18 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496189-112644 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 16 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496180-112644 Reference 14: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (i) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496158-112644 Reference 15: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(e)(1)) -URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 16: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 40 -Section 50 -Paragraph 6 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126731327&loc=SL126733271-114008 + Details
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