Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2018

Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]

The tables below summarizes the impact of adoption for the three and six months ended June 30, 2018:



	Three Months Ended June 30, 2018
	Under ASC 606		Under ASC 605		Increase		% Increase
	(In thousands)
Revenues
Crude oil		$229,798		$229,658		$140	0.1	%
Natural gas liquids	21,269		20,139		1,130		5.6	%
Natural gas	12,906		12,272		634		5.2	%
Total revenues	263,973		262,069		1,904		0.7	%

Costs and Expenses
Lease operating	35,151		33,247		1,904		5.7	%

Income Before Income Taxes		$35,792		$35,792		$—	—	%



	Six Months Ended June 30, 2018
	Under ASC 606		Under ASC 605		Increase		% Increase
	(In thousands)
Revenues
Crude oil		$424,717		$424,452		$265	0.1	%
Natural gas liquids	38,171		36,235		1,936		5.3	%
Natural gas	26,365		25,159		1,206		4.8	%
Total revenues	489,253		485,846		3,407		0.7	%

Costs and Expenses
Lease operating	74,424		71,017		3,407		4.8	%

Income Before Income Taxes		$63,603		$63,603		$—	—	%

Schedule of Supplemental Net Income Per Common Share

Supplemental net income attributable to common shareholders per common share information is provided below:



	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
	(In thousands, except per share amounts)
Net Income Attributable to Common Shareholders		$30,095		$56,306		$44,838		$96,327
Basic weighted average common shares outstanding	82,058		65,767		81,802		65,479
Effect of dilutive instruments	1,795		141		1,438		387
Diluted weighted average common shares outstanding	83,853		65,908		83,240		65,866
Net Income Attributable to Common Shareholders Per Common Share
Basic		$0.37		$0.86		$0.55		$1.47
Diluted		$0.36		$0.85		$0.54		$1.46

Schedule of Reconciliation of the Weighted Average Common Shares Outstanding [Table Text Block]

The table below presents the a reconciliation of the basic weighted average common shares outstanding to diluted weighted average common shares outstanding for the three and six months ended June 30, 2018 and 2017:



	Three Months Ended June 30,		Six Months Ended June 30,
	2018	2017	2018	2017
	(In thousands)
Basic weighted average common shares outstanding	82,058	65,767	81,802	65,479
Dilutive unvested restricted stock awards and units	833	141	640	387
Dilutive unvested performance shares	134	—	158	—
Dilutive exercisable common stock warrants	828	—	640	—
Diluted weighted average common shares outstanding	83,853	65,908	83,240	65,866

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

The table below presents a summary of the common shares outstanding that were excluded from the computation of diluted net income attributable to common shareholders per common share for the three and six months ended June 30, 2018 and 2017, as their inclusion would be anti-dilutive:



	Three Months Ended June 30,		Six Months Ended June 30,
	2018	2017	2018	2017
	(In thousands)
Anti-dilutive unvested restricted stock awards and units	16	101	17	16
Anti-dilutive unvested performance shares	—	108	2	62
Anti-dilutive exercisable common stock warrants	—	—	—	—
Total anti-dilutive	16	209	19	78