Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 715,505	$ 689,981	$ 515,301	$ 1,204,083	$ 1,399,134	$ 1,401,638	$ 1,409,409	$ 1,191,335	$ 3,124,870	$ 5,401,516	$ 3,410,728
Operating income (loss)	(114,132)	2,750	(25,443)	(181,173)	59,531	18,405	48,621	21,423	(317,998)	147,980	81,941
Net income (loss)	$ (131,918)	$ (14,271)	$ (40,560)	$ (222,337)	$ 35,439	$ (83,891)	$ 28,169	$ 61,092	$ (409,086)	$ 40,809	$ 39,427
Net loss per share
Basic (USD per share)	$ (2.47)	$ (0.27)	$ (0.76)	$ (4.18)	$ 0.68	$ (1.65)	$ 0.56	$ 1.23	$ (7.68)	$ 0.80	$ 0.85
Diluted (USD per share)	$ (2.47)	$ (0.27)	$ (0.76)	$ (4.18)	$ 0.68	$ (1.65)	$ 0.56	$ 1.14	$ (7.68)	$ 0.80	$ 0.85