Supplemental Cash Flow Information (Tables)

9 Months Ended

Sep. 30, 2014

Supplemental Cash Flow Elements [Abstract]

Summary of Supplemental Cash Flow Information

The following table discloses supplemental cash flow information about cash paid for interest and income taxes. Also disclosed is information about investing activities that affects recognized assets and liabilities but does not result in cash receipts or payments.

	Nine months ended September 30,
In thousands	2014		2013
Supplemental cash flow information:
Cash paid for interest	$	173,057	$	139,023
Cash paid for income taxes	4,012		23,413
Cash received for income tax refunds	5		173
Non-cash investing activities:
Increase in accrued capital expenditures	235,431		69,767
Asset retirement obligation additions and revisions, net	6,232		5,043