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Stockholders Equity | 6 Months Ended
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Jun. 30, 2021
Stockholders Equity Note [Abstract] |
Stockholders Equity | Note 13 – Stockholders’ equity: Accumulated other comprehensive loss - Changes in accumulated other comprehensive loss attributable to NL stockholders, including amounts resulting from our investment in Kronos Worldwide (see Note 5), are presented in the table below.
| Three months ended |  |  | Six months ended |
| June 30, |  |  | June 30, |
| 2020 |  |  | 2021 |  |  | 2020 |  |  | 2021 |
| (In thousands) |
Accumulated other comprehensive loss, net of tax: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Currency translation: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | (182,961 | ) |  | $ | (169,030 | ) |  | $ | (172,843 | ) |  | $ | (169,575 | )
Other comprehensive income (loss) |  | 4,364 |  |  |  | 402 |  |  |  | (5,754 | ) |  |  | 947 |
Balance at end of period | $ | (178,597 | ) |  | $ | (168,628 | ) |  | $ | (178,597 | ) |  | $ | (168,628 | )
Defined benefit pension plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | (77,214 | ) |  | $ | (79,553 | ) |  | $ | (78,257 | ) |  | $ | (80,704 | )
Other comprehensive income - amortization of net losses included in net periodic pension cost |  | 1,031 |  |  |  | 1,144 |  |  |  | 2,074 |  |  |  | 2,295 |
Balance at end of period | $ | (76,183 | ) |  | $ | (78,409 | ) |  | $ | (76,183 | ) |  | $ | (78,409 | )
OPEB plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | (670 | ) |  | $ | (981 | ) |  | $ | (590 | ) |  | $ | (910 | )
Other comprehensive loss - amortization of net gains included in net periodic OPEB cost |  | (71 | ) |  |  | (64 | ) |  |  | (151 | ) |  |  | (135 | )
Balance at end of period | $ | (741 | ) |  | $ | (1,045 | ) |  | $ | (741 | ) |  | $ | (1,045 | )
Total accumulated other comprehensive loss: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | (260,845 | ) |  | $ | (249,564 | ) |  | $ | (251,690 | ) |  | $ | (251,189 | )
Other comprehensive income (loss) |  | 5,324 |  |  |  | 1,482 |  |  |  | (3,831 | ) |  |  | 3,107 |
Balance at end of period | $ | (255,521 | ) |  | $ | (248,082 | ) |  | $ | (255,521 | ) |  | $ | (248,082 | )
See Note 11 for amounts related to our defined benefit pension plans. Other – During the first quarter of 2021, CompX purchased 50,000 shares of its Class A common stock in a market transaction for approximately $755,000. At June 30, 2021, 627,547 shares were available for purchase under CompX’s prior repurchase authorizations.

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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://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 http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: 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 http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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