Supplemental Cash Flow Information (Tables)

6 Months Ended

Jun. 30, 2018

Supplemental Cash Flow Elements [Abstract]

Schedule of Cash Flow, Supplemental Disclosures

Supplemental cash flow disclosures and non-cash investing activities are presented below:

	Six Months Ended June 30,
	2018			2017
	(In thousands)
Supplemental cash flow disclosures:
Cash paid for interest, net of amounts capitalized		$29,853			$39,603
Non-cash investing activities:
Increase in capital expenditure payables and accruals		$35,543			$48,395
Contingent consideration arrangement related to divestitures of oil and gas properties	(7,880		)	—