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Loss Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Earnings Per Share [Abstract]                
Net loss $ (21,551) $ (5,494) $ (37,144) $ (532,987) $ (13,734) $ (7,888) $ (64,189) $ (554,609)
Basic - weighted average shares outstanding (in shares) 111,607     110,295     111,459 109,977
Dilutive effect of stock options and restricted stock (in shares) 0     0     0 0
Diluted - weighted average shares outstanding (in shares) 111,607     110,295     111,459 109,977
Loss per share                
Basic (in USD per share) $ (0.19)     $ (4.83)     $ (0.58) $ (5.04)
Diluted (in USD per share) $ (0.19)     $ (4.83)     $ (0.58) $ (5.04)