Earnings per Share (Tables)

6 Months Ended

Jun. 30, 2018

Earnings Per Share [Abstract]

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

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

	For the Three Months Ended   June 30,		For the Six Months Ended   June 30,
	2018	2017	2018	2017
	(in thousands)
Anti-dilutive	—	44	—	59

Schedule of calculations of basic and diluted net loss per common share

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,
	2018		2017			2018		2017
	(in thousands, except per share data)
Net income (loss)	$	17,197	$	(119,907	)	$	334,598	$	(45,473	)
Basic weighted-average common shares outstanding	111,701		111,277			111,698		111,274
Dilutive effect of non-vested RSUs and contingent PSUs	1,929		—			1,569		—
Dilutive effect of Senior Convertible Notes	—		—			—		—
Diluted weighted-average common shares outstanding	113,630		111,277			113,267		111,274
Basic net income (loss) per common share	$	0.15	$	(1.08	)	$	3.00	$	(0.41	)
Diluted net income (loss) per common share	$	0.15	$	(1.08	)	$	2.95	$	(0.41	)