Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2019

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2019		2018		2019		2018
	(In thousands, except per share amounts)
Amounts attributable to common stockholders:
Net income:
Net income — basic	$	72,329	$	103,239	$	151,652	$	185,227
After tax interest on convertible debt	—		15		—		30
Net income — diluted	$	72,329	$	103,254	$	151,652	$	185,257
Weighted average shares (denominator):
Weighted average shares — basic	182,369		182,637		182,048		183,877
Stock options	3,278		4,265		3,418		4,391
Restricted stock units	43		165		51		158
Convertible debt	—		121		—		121
Weighted average shares — diluted	185,690		187,188		185,517		188,547
Net income per share:
Basic	$	0.40	$	0.57	$	0.83	$	1.01
Diluted	$	0.39	$	0.55	$	0.82	$	0.98

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]

	Three Months Ended		Six Months Ended
	June 30,		June 30,
	2019	2018	2019	2018
	(In thousands)
Antidilutive options	105	1,155	—	868