Supplemental quarterly financial data (unaudited) (Tables)

12 Months Ended

Dec. 31, 2021

Quarterly Financial Information Disclosure [Abstract]

Schedule of results of operations by quarter

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

	December 31, 2021
(in thousands, except per share data)	First Quarter		Second Quarter		Third Quarter		Fourth Quarter
Revenues	$	250,230	$	294,371	$	379,250	$	470,224
Operating income	$	102,803	$	108,347	$	265,736	$	243,449
Net income (loss)	$	(75,439)	$	(132,661)	$	136,832	$	216,276
Net income (loss) per common share:
Basic	$	(6.33)	$	(10.47)	$	8.68	$	13.07
Diluted	$	(6.33)	$	(10.47)	$	8.56	$	12.84

	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 during the year ended December 31, 2020.

(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.b.