Revenue from Contracts with Customers (Tables)

12 Months Ended

Dec. 31, 2018

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue [Table Text Block]

The tables below present the disaggregation of oil, gas, and NGL production revenue by product type for each of the Company’s operating regions for the years ended December 31, 2018, 2017, and 2016:

	For the year ended December 31, 2018
	Permian			South Texas & Gulf Coast			Rocky Mountain			Total
	(in thousands)
Oil, gas, and NGL production revenue:
Oil production revenue	$	938,004		$	72,821		$	54,851		$	1,065,676
Gas production revenue	125,603			227,252			1,595			354,450
NGL production revenue	1,000			214,441			790			216,231
Total	$	1,064,607		$	514,514		$	57,236		$	1,636,357
Relative percentage	65		%	32		%	3		%	100		%

____________________________________________

Note: Amounts may not calculate due to rounding.

	For the year ended December 31, 2017
	Permian			South Texas & Gulf Coast			Rocky Mountain			Total
	(in thousands)
Oil, gas, and NGL production revenue:
Oil production revenue	$	419,732		$	82,674		$	151,844		$	654,250
Gas production revenue	61,781			301,780			5,849			369,410
NGL production revenue	547			226,031			3,545			230,123
Total	$	482,060		$	610,485		$	161,238		$	1,253,783
Relative percentage	38		%	49		%	13		%	100		%

____________________________________________

Note: Amounts may not calculate due to rounding.

	For the year ended December 31, 2016
	Permian			South Texas & Gulf Coast			Rocky Mountain			Total
	(in thousands)
Oil, gas, and NGL production revenue:
Oil production revenue	$	117,399		$	189,313		$	305,126		$	611,838
Gas production revenue	17,315			308,829			11,144			337,288
NGL production revenue	92			225,821			3,387			229,300
Total	$	134,806		$	723,963		$	319,657		$	1,178,426
Relative percentage	11		%	62		%	27		%	100		%

____________________________________________

Note: Amounts may not calculate due to rounding.