CONSOLIDATED BALANCE SHEETS (in thousands, except share data) Parenthetical - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Other property and equipment, accumulated depreciation	$ 63,662	$ 64,032
Common Stock, par value per share	$ 0.01	$ 0.01
Common Stock, shares authorized	200,000,000	200,000,000
Common Stock, shares issued	114,742,304	112,987,952
Common Stock, shares outstanding	114,742,304	112,987,952