Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2017

Earnings Per Share [Abstract]

Basic and Diluted Earnings per share

The following table sets forth the calculation of EPS for the years ended December 31, 2017, 2016, and 2015:

	Year Ended December 31,
	2017		2016		2015
	(In thousands, except per share amounts)
Weighted average basic common shares outstanding	20,420		21,161		23,148
Dilutive effect of employee stock purchases, net of assumed repurchase of treasury stock	5		9		4
Weighted average dilutive common shares outstanding	20,425		21,170		23,152
Basic:
Net income	$	213,442	$	147,065	$	93,999
Less: Earnings allocated to participating securities	7,512		5,871		3,595
Earnings available to basic common shares	$	205,930	$	141,194	$	90,404
Basic earnings per common share	$	10.08	$	6.67	$	3.91
Diluted:
Net income	$	213,442	$	147,065	$	93,999
Less: Earnings allocated to participating securities	7,511		5,869		3,595
Earnings available to diluted common shares	$	205,931	$	141,196	$	90,404
Diluted earnings per common share	$	10.08	$	6.67	$	3.90