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Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive (Loss) [Member] | Treasury Stock (at cost) [Member] | Total Nucor Stockholders' Equity [Member] | Noncontrolling Interests [Member]
--- | --- | --- | --- | --- | --- | --- | --- | ---
BALANCES, beginning of period at Dec. 31, 2017 | $ 9,084,788 | $ 151,960 | $ 2,021,339 | $ 8,463,709 | $ (254,681) | $ (1,643,291) | $ 8,739,036 | $ 345,752
BALANCES, shares at beginning of period at Dec. 31, 2017 |  | 379,900 |  |  |  | 61,931 |  |
Net earnings | 2,481,084 |  |  | 2,360,767 |  |  | 2,360,767 | 120,317
Other comprehensive income (loss) | (49,452) |  |  |  | (49,452) |  | (49,452) |
Stock options exercised | $ 24,102 | $ 84 | 14,675 |  |  | $ 9,343 | 24,102 |
Stock options exercised (in shares) | 543 | 210 |  |  |  | (333) |  |
Stock option expense | $ 4,563 |  | 4,563 |  |  |  | 4,563 |
Issuance of stock under award plans, net of forfeitures | 52,313 | $ 17 | 31,361 |  |  | $ 20,935 | 52,313 |
Issuance of stock under award plans, net of forfeitures, shares |  | 44 |  |  |  | (762) |  |
Amortization of unearned compensation | 1,777 |  | 1,777 |  |  |  | 1,777 |
Treasury stock value acquired | (853,997) |  |  |  |  | $ (853,997) | (853,997) |
Treasury stock shares acquired |  |  |  |  |  | 13,726 |  |
Cash dividends declared | (487,031) |  |  | (487,031) |  |  | (487,031) |
Distributions to noncontrolling interests | (56,179) |  |  |  |  |  |  | (56,179)
BALANCES, end of period at Dec. 31, 2018 | 10,201,968 | $ 152,061 | 2,073,715 | 10,337,445 | (304,133) | $ (2,467,010) | 9,792,078 | 409,890
BALANCES, shares at end of period at Dec. 31, 2018 |  | 380,154 |  |  |  | 74,562 |  |
Net earnings | 1,370,910 |  |  | 1,271,143 |  |  | 1,271,143 | 99,767
Other comprehensive income (loss) | (718) |  |  |  | (718) |  | (718) |
Stock options exercised | $ 16,146 |  | 1,624 |  |  | $ 14,522 | 16,146 |
Stock options exercised (in shares) | 425 |  |  |  |  | (425) |  |
Stock option expense | $ 4,662 |  | 4,662 |  |  |  | 4,662 |
Issuance of stock under award plans, net of forfeitures | 62,735 |  | 25,637 |  |  | $ 37,098 | 62,735 |
Issuance of stock under award plans, net of forfeitures, shares |  |  |  |  |  | (1,095) |  |
Amortization of unearned compensation | 2,008 |  | 2,008 |  |  |  | 2,008 |
Treasury stock value acquired | (298,541) |  |  |  |  | $ (298,541) | (298,541) |
Treasury stock shares acquired |  |  |  |  |  | 5,300 |  |
Cash dividends declared | (491,647) |  |  | (491,647) |  |  | (491,647) |
Distributions to noncontrolling interests | (76,347) |  |  |  |  |  |  | (76,347)
Other |  |  |  | (1,885) | 1,885 |  |  |
BALANCES, end of period at Dec. 31, 2019 | 10,791,176 | $ 152,061 | 2,107,646 | 11,115,056 | (302,966) | $ (2,713,931) | 10,357,866 | 433,310
BALANCES, shares at end of period at Dec. 31, 2019 |  | 380,154 |  |  |  | 78,342 |  |
Net earnings | 836,028 |  |  | 721,470 |  |  | 721,470 | 114,558
Other comprehensive income (loss) | 184,105 |  |  |  | 184,105 |  | 184,105 |
Stock options exercised | $ 11,846 |  | 2,590 |  |  | $ 9,256 | 11,846 |
Stock options exercised (in shares) | 266 |  |  |  |  | (266) |  |
Stock option expense | $ 2,736 |  | 2,736 |  |  |  | 2,736 |
Issuance of stock under award plans, net of forfeitures | 51,898 |  | 17,399 |  |  | $ 34,499 | 51,898 |
Issuance of stock under award plans, net of forfeitures, shares |  |  |  |  |  | (992) |  |
Amortization of unearned compensation | 1,753 |  | 1,753 |  |  |  | 1,753 |
Treasury stock value acquired | (39,499) |  |  |  |  | $ (39,499) | (39,499) |
Treasury stock shares acquired |  |  |  |  |  | 825 |  |
Cash dividends declared | (492,674) |  |  | (492,674) |  |  | (492,674) |
Distributions to noncontrolling interests | (115,508) |  |  |  |  |  |  | (115,508)
Other |  |  | (10,836) |  |  |  | (10,836) | 10,836
BALANCES, end of period at Dec. 31, 2020 | $ 11,231,861 | $ 152,061 | $ 2,121,288 | $ 11,343,852 | $ (118,861) | $ (2,709,675) | $ 10,788,665 | $ 443,196
BALANCES, shares at end of period at Dec. 31, 2020 |  | 380,154 |  |  |  | 77,909 |  |

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