Earnings per Share (Tables)

6 Months Ended

Jun. 30, 2019

Earnings Per Share [Abstract]

Schedule of antidilutive securities excluded from computation of earnings per share [Table Text Block]

The following table details the weighted-average anti-dilutive securities for the periods presented:

	For the Three Months Ended June 30,		For the Six Months Ended June 30,
	2019	2018	2019	2018
	(in thousands)
Anti-dilutive	—	—	715	—

Schedule of calculations of basic and diluted net income (loss) per common share [Table Text Block]

The following table sets forth the calculations of basic and diluted net income (loss) per common share:

	For the Three Months Ended June 30,				For the Six Months Ended June 30,
	2019		2018		2019			2018
	(in thousands, except per share data)
Net income (loss)	$	50,388	$	17,197	$	(127,180	)	$	334,598
Basic weighted-average common shares outstanding	112,262		111,701		112,257			111,698
Dilutive effect of non-vested RSUs and contingent PSUs	670		1,929		—			1,569
Diluted weighted-average common shares outstanding	112,932		113,630		112,257			113,267
Basic net income (loss) per common share	$	0.45	$	0.15	$	(1.13	)	$	3.00
Diluted net income (loss) per common share	$	0.45	$	0.15	$	(1.13	)	$	2.95