Earnings per Share (Tables)

12 Months Ended

Dec. 31, 2017

Earnings Per Share [Abstract]

Reconciliation of information used in computing basic and diluted earnings per share

The following table sets forth a reconciliation of the information used in computing basic and diluted earnings per share:

	Years Ended December 31,
	2017		2016		2015
Net earnings from continuing operations	$	811,665	$	508,892	$	595,881
Earnings from discontinued operations, net	—		—		273,948
Net earnings	$	811,665	$	508,892	$	869,829
Basic earnings per common share:
Net earnings from continuing operations	$	5.21	$	3.28	$	3.78
Earnings from discontinued operations, net	$	—	$	—	$	1.74
Net earnings	$	5.21	$	3.28	$	5.52
Weighted average basic shares outstanding	155,685,000		155,231,000		157,619,000
Diluted earnings per common share:
Net earnings from continuing operations	$	5.15	$	3.25	$	3.74
Earnings from discontinued operations, net	$	—	$	—	$	1.72
Net earnings	$	5.15	$	3.25	$	5.46
Weighted average diluted shares outstanding	157,744,000		156,636,000		159,172,000

Reconciliation of share amounts used in computing earnings per share

The following table is a reconciliation of the share amounts used in computing earnings per share:

	Years Ended December 31,
	2017	2016	2015
Weighted average shares outstanding - Basic	155,685,000	155,231,000	157,619,000
Dilutive effect of assumed exercise of SARs and vesting of performance shares and RSUs	2,059,000	1,405,000	1,553,000
Weighted average shares outstanding - Diluted	157,744,000	156,636,000	159,172,000