Supplemental Cash Flow Information (Tables)

3 Months Ended

Mar. 31, 2019

Supplemental Cash Flow Elements [Abstract]

Supplemental Cash Flow Information

The following is supplemental information to the condensed consolidated statement of cash flows:

	Three Months Ended March 31, 2019		Three Months Ended March 31, 2018
	(In Thousands)
Supplemental disclosures of non-cash investing activities:
Depreciation, depletion and amortization capitalized into development costs	$	3,180	$	—