Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 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 six months 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		265		$	65.80
Exercised		(288	)	$	42.64			$	7,253
Canceled		—		$	—
Outstanding at June 30, 2018		4,083		$	49.49		6.8 years	$	53,997
Stock options exercisable at June 30, 2018		2,368		$	45.50		5.6 years	$	40,350

Schedule of Grant Date Fair Value Black-Scholes Option-Pricing Model Assumptions

For the 2018 stock option grant, the grant date fair value of $15.07 per share was calculated using the Black-Scholes option-pricing model with the following assumptions:

Exercise price	$	65.80
Expected dividend yield		2.31	%
Expected stock price volatility		25.28	%
Risk-free interest rate		2.85	%
Expected life (years)		6.5

Summary of Nucor's RSU Activity

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

	Shares			Grant Date Fair Value
RSUs:
Unvested at beginning of year		1,071		$	52.62
Granted		1,013		$	65.80
Vested		(762	)	$	59.20
Canceled		(10	)	$	53.50
Unvested at June 30, 2018		1,312		$	58.97

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 six months of 2018 is as follows (shares in thousands):

	Shares			Grant Date Fair Value
RSUs and Restricted stock awards:
Unvested at beginning of year		91		$	54.50
Granted		256		$	67.68
Vested		(212	)	$	64.99
Canceled		—			—
Unvested at June 30, 2018		135		$	62.99