Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2018

Earnings Per Share [Abstract]

Computations of Basic and Diluted Net Earnings Per Share

The computations of basic and diluted net earnings per share are as follows (in thousands, except per share data):

Year Ended December 31,	2018			2017			2016
Basic net earnings per share:
Basic net earnings	$	2,360,767		$	1,318,688		$	796,271
Earnings allocated to participating securities		(9,344	)		(4,549	)		(2,632	)
Net earnings available to common stockholders	$	2,351,423		$	1,314,139		$	793,639
Average shares outstanding		315,858			319,990			319,563
Basic net earnings per share	$	7.44		$	4.11		$	2.48
Diluted net earnings per share:
Diluted net earnings	$	2,360,767		$	1,318,688		$	796,271
Earnings allocated to participating securities		(9,317	)		(4,539	)		(2,631	)
Net earnings available to common stockholders	$	2,351,450		$	1,314,149		$	793,640
Diluted average shares outstanding:
Basic shares outstanding		315,858			319,990			319,563
Dilutive effect of stock options and other		875			783			259
		316,733			320,773			319,822
Diluted net earnings per share	$	7.42		$	4.10		$	2.48

Anti-dilutive Stock Options

The following stock options were excluded from the computation of diluted net earnings per share because their effect would have been anti-dilutive (shares in thousands):                

Year Ended December 31,	2018		2017		2016
Anti-dilutive stock options:
Weighted-average shares		156		407		942
Weighted-average exercise price	$	65.80	$	59.07	$	47.04