Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of Stock Option Plans Activity

A summary of activity under Nucor’s stock option plans for the first quarter of 2018 is as follows (in thousands, except years and per share amounts):

	Shares			Weighted - Average Exercise Price		Weighted - Average Remaining Contractual Life		Aggregate Intrinsic Value
Number of shares under stock options:
Outstanding at beginning of year		4,106		$	47.96
Granted		—			—
Exercised		(288	)	$	42.64			$	7,253
Canceled		—			—
Outstanding at March 31, 2018		3,818		$	48.36		6.9 years	$	48,614
Stock options exercisable at March 31, 2018		1,521		$	43.53		4.9 years	$	26,701

Summary of Nucor's RSU Activity

A summary of Nucor’s RSU activity for the first quarter of 2018 is as follows (shares in thousands):

	Shares			Grant Date Fair Value
Restricted stock units:
Unvested at beginning of year		1,071		$	52.62
Granted		—			—
Vested		(8	)	$	53.99
Canceled		(5	)	$	53.51
Unvested at March 31, 2018		1,058		$	52.60

Summary of Nucor's Restricted Stock Activity under AIP and LTIP

A summary of Nucor’s restricted stock activity under the AIP and the LTIP for the first quarter of 2018 is as follows (shares in thousands):

	Shares			Grant Date Fair Value
Restricted stock awards and units:
Unvested at beginning of year		91		$	54.50
Granted		256		$	67.68
Vested		(212	)	$	64.99
Canceled		—			—
Unvested at March 31, 2018		135		$	62.99