Earnings (Loss) Per Share (Schedule of Earnings (Loss) Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share [Abstract]
Earnings (loss) of basic income (loss) attributable to Unit Corporation per common share	$ (1,937)	$ (770,494)
Weighted shares of basic earnings (loss) attributable to Unit Corporation per common share	12,000	53,131
Per-Share amount of basic earnings (loss) attributable to Unit Corporation per common share	$ (0.16)	$ (14.50)