Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Earnings Per Share [Abstract]
Net earnings (loss)	$ 606,959	$ (1,237,574)	$ 468,636
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic	(10,248)	(1,782)	(5,182)
Net Income (Loss) Available to Common Stockholders, Basic	$ 596,711	$ (1,239,356)	$ 463,454
Weighted-average basic shares and unvested restricted stock outstanding	119,349	118,463	120,468
Less: weighted-average unvested restricted stock outstanding	(2,255)	(1,610)	(1,502)
Weighted-average basic shares outstanding	117,094	116,853	118,966
Basic income per share (usd per share)	$ 5.10	$ (10.61)	$ 3.90
Net earnings (loss) allocated to common shares	$ 596,711	$ (1,239,356)	$ 463,454
Diluted income per share (usd per share)	$ 5.10	$ (10.61)	$ 3.90