Stock-Based Compensation (Tables)

3 Months Ended

Mar. 30, 2019

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 2019 is as follows (in thousands, except years and per share amounts):

				Weighted -		Weighted -
				Average		Average		Aggregate
				Exercise		Remaining		Intrinsic
	Shares			Price		Contractual Life		Value
Number of shares under stock options:
Outstanding at beginning of year		3,828		$	49.71
Granted		—		$	—
Exercised		(88	)	$	35.76			$	2,157
Canceled		—		$	—
Outstanding at March 30, 2019		3,740		$	50.04		6.3 years	$	33,576
Stock options exercisable at March 30, 2019		2,024		$	45.83		4.9 years	$	25,618

Summary of Nucor's RSU Activity

The fair value of an RSU is determined based on the closing price of Nucor’s common stock on the date of the grant. A summary of Nucor’s RSU activity for the first quarter of 2019 is as follows (shares in thousands):

				Grant Date
	Shares			Fair Value
Restricted stock units:
Unvested at beginning of year		1,246		$	59.09
Granted		—		$	—
Vested		(40	)	$	54.46
Canceled		(10	)	$	62.98
Unvested at March 30, 2019		1,196		$	59.21

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 2019 is as follows (shares in thousands):

				Grant Date
	Shares			Fair Value
Restricted stock awards and units:
Unvested at beginning of year		130		$	62.97
Granted		316		$	58.04
Vested		(280	)	$	58.65
Canceled		—		$	—
Unvested at March 30, 2019		166		$	60.87