Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2017

Earnings Per Share [Abstract]

Reconciliation Between Basic and Diluted Earnings Per Share

A reconciliation between basic and diluted earnings per share is as follows (in thousands, except per share data):

	Quarter Ended March 31,
	2017		2016
Net income for basic and diluted earnings per share	$	214,726	$	99,140
Weighted-average common shares outstanding	214,870		216,914
Dilutive effect of stock options, performance share awards and restricted stock awards	943		955
Diluted weighted-average shares outstanding	215,813		217,869
Basic earnings per share	$	1.00	$	0.46
Diluted earnings per share	$	0.99	$	0.46