Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2017

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 nine months of 2017 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		3,591		$	45.32
Granted		698		$	59.07
Exercised		(144	)	$	37.54			$	3,618
Canceled		—			—
Outstanding at September 30, 2017		4,145		$	47.90		7.1 years	$	35,842
Stock options exercisable at September 30, 2017		1,848		$	43.37		5.2 years	$	23,415

Summary of Nucor's RSU Activity

A summary of Nucor’s RSU activity for the first nine months of 2017 is as follows (shares in thousands):

	Shares			Grant Date Fair Value
Restricted stock units:
Unvested at beginning of year		1,040		$	48.47
Granted		721		$	59.07
Vested		(634	)	$	53.21
Canceled		(13	)	$	50.21
Unvested at September 30, 2017		1,114		$	52.61
Shares reserved for future grants (stock options and RSUs)		7,268

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 nine months of 2017 is as follows (shares in thousands):

	Shares			Grant Date Fair Value
Restricted stock awards and units:
Unvested at beginning of year		67		$	45.77
Granted		172		$	60.62
Vested		(144	)	$	51.69
Canceled		—			—
Unvested at September 30, 2017		95		$	54.45
Shares reserved for future grants		683