Earnings (Loss) per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Numerator:
Net income (loss)	$ (87,159)	$ 14,774	$ (287,863)	$ (112,321)	$ (157,304)	$ (99,140)	$ (144,428)	$ (27,828)	$ (472,569)	$ (428,700)	$ 335,255
Denominator:
Weighted-average shares outstanding, basic (in shares)									105,000	84,692	68,429
Effect of dilutive stock awards (in shares)									0	0	130
Adjusted weighted-average shares outstanding, diluted (in shares)									105,000	84,692	68,559
Earnings (Loss) per Share:
Basic earnings per common share (in dollars per share)	$ (0.80)	$ 0.14	$ (2.73)	$ (1.15)	$ (1.61)	$ (1.07)	$ (1.81)	$ (0.41)	$ (4.50)	$ (5.06)	$ 4.90
Diluted earnings per common share (in dollars per share)	$ (0.80)	$ 0.14	$ (2.73)	$ (1.15)	$ (1.61)	$ (1.07)	$ (1.81)	$ (0.41)	$ (4.50)	$ (5.06)	$ 4.89