Earnings per share (Tables)

6 Months Ended

Jun. 30, 2018

Earnings per share

Schedule of basic and diluted net income per share

The following table sets forth the computation of basic and diluted net income per share (in thousands, except per share amounts):

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2018		2017		2018		2017
Net income	$	68,936	$	25,377	$	89,295	$	46,890
Less net income allocated to participating securities:
Non-forfeitable dividends on participating securities		(91)		(92)		(179)		(189)
Income allocated to participating securities		(187)		(12)		(187)		(12)
Total net income allocated to participating securities		(278)		(104)		(366)		(201)
Net income available to common stockholders		68,658		25,273		88,929		46,689
Effect of dilutive securities:
Participating securities		278		104		366		201
Net income for diluted net income per share	$	68,936	$	25,377	$	89,295	$	46,890
Shares for basic net income per share		39,471		39,414		39,461		39,390
Effect of dilutive securities:
Stock options		2		11		2		11
Performance-based stock units		132		207		132		207
Participating securities		160		162		155		161
Total effect of dilutive securities		294		380		289		379
Shares for diluted net income per share		39,765		39,794		39,750		39,769
Basic net income per share	$	1.74	$	0.64	$	2.25	$	1.19
Diluted net income per share	$	1.73	$	0.64	$	2.25	$	1.18