Nature of Ops and Sign. Acctg Policies (Antidilutive Securities) (Details 4) - shares shares in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share
Number of antidilutive equity-based instruments outstanding	0	1,220	0
Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share
Number of antidilutive equity-based instruments outstanding	0	5,526	0
Stock appreciation rights
Antidilutive Securities Excluded from Computation of Earnings Per Share
Number of antidilutive equity-based instruments outstanding	0	0	1,981
Restricted stock and performance-based equity awards
Antidilutive Securities Excluded from Computation of Earnings Per Share
Number of antidilutive equity-based instruments outstanding	0	0	4,445