Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted

	Three Months Ended
	March 31,
	2018		2017
	(In thousands, except per share amounts)
Amounts attributable to common stockholders:
Net income:
Net income — basic	$	81,988	$	174,702
After tax interest on convertible debt	15		12
Net income — diluted	$	82,003	$	174,714
Weighted average shares (denominator):
Weighted average shares — basic	185,130		188,260
Stock options	4,522		4,425
Restricted stock units	150		61
Convertible debt	121		121
Weighted average shares — diluted	189,923		192,867
Net income per share:
Basic	$	0.44	$	0.93
Diluted	$	0.43	$	0.91

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

	Three Months Ended
	March 31,
	2018	2017
	(In thousands)
Antidilutive options	577	898