Selected Quarterly Financial Data (Tables)

12 Months Ended

Dec. 31, 2017

Quarterly Financial Information Disclosure [Abstract]

Schedule Of Unaudited Quarterly Financial Data

Unaudited quarterly financial data are as follows (in thousands):

	March 31			June 30			September 30			December 31
Quarter Ended 2017
Revenues	$	101,824		$	95,426		$	99,962		$	115,616
Operating income	$	7,287		$	6,314		$	13,329		$	18,370
Price risk management activities income (expense)	$	45,893		$	38,995		$	(28,086	)	$	(84,365	)
Net income (loss)	$	34,462		$	24,607		$	(36,177	)	$	(85,760	)
Quarter Ended 2016
Revenues	$	50,656		$	67,405		$	63,775		$	76,918
Operating loss	$	(40,011	)	$	(20,697	)	$	(12,868	)	$	(7,103	)
Price risk management activities income (expense)	$	12,924		$	(48,930	)	$	11,350		$	(32,742	)
Net loss	$	(40,799	)	$	(84,715	)	$	(22,219	)	$	(60,354	)