Supplemental quarterly financial data (unaudited)

12 Months Ended

Dec. 31, 2020

Quarterly Financial Information Disclosure [Abstract]

Supplemental quarterly financial data (unaudited)

Note 21 Supplemental quarterly financial data (unaudited)

The Company's results by quarter for the periods presented are as follows:

	December 31, 2020
(in thousands, except per share data)	First Quarter(1)		Second Quarter(1)		Third Quarter(1)		Fourth Quarter(1)
Revenues	$	204,992	$	110,588	$	173,547	$	188,065
Operating loss	$	(181,972)	$	(434,052)	$	(167,678)	$	(78,031)
Net income (loss)	$	74,646	$	(545,455)	$	(237,432)	$	(165,932)
Net income (loss) per common share:(2)
Basic	$	6.43	$	(46.75)	$	(20.32)	$	(14.18)
Diluted	$	6.39	$	(46.75)	$	(20.32)	$	(14.18)

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(1)See Note 6.a for discussion of the Company's full cost ceiling impairments recorded.

(2)Per share data was retroactively adjusted to reflect the Company's 1-for-20 reverse stock split effective June 1, 2020, as described in Note 8.a.

	December 31, 2019
(in thousands, except per share data)	First Quarter		Second Quarter(1)		Third Quarter(2)		Fourth Quarter(2)
Revenues	$	208,947	$	216,643	$	193,569	$	218,122
Operating income (loss)	$	54,397	$	57,828	$	(350,439)	$	(170,377)
Net income (loss)	$	(9,491)	$	173,382	$	(264,629)	$	(241,721)
Net income (loss) per common share:(3)
Basic	$	(0.82)	$	14.99	$	(22.86)	$	(20.86)
Diluted	$	(0.82)	$	14.98	$	(22.86)	$	(20.86)

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(1)See Note 16.a for discussion of a favorable litigation settlement received.

(2)See Note 6.a for discussion of the Company's full cost ceiling impairments recorded.

(3)Per share data was retroactively adjusted to reflect the Company's 1-for-20 reverse stock split effective June 1, 2020, as described in Note 8.a.