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Equity Incentive Programs (Deferred Stock Unit Activity) (Details) - Deferred Stock Units (DSUs) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Units    
Outstanding, Units, beginning balance (in shares) 500,961  
Granted, Units (in shares) 221,616  
Dividend equivalents granted, Units (in shares) 0  
Settled, Units (in shares) (35,186)  
Outstanding, Units, ending balance (in shares) 687,391 500,961
Weighted- Average Grant Date Fair Value Per Share    
Outstanding, beginning of year, Weighted-Average Grant Date Fair Value Per Share (in dollars per share) $ 10.69  
Granted, Weighted-Average Grant Date Fair Value Per Share (in dollars per share) 3.82  
Dividend equivalents granted, Weighted-Average Grant Date Fair Value Per Share (in dollars per share) 0  
Settled, Weighted-Average Grant Date Fair Value Per Share (in dollars per share) 11.53  
Outstanding, end of year, Weighted-Average Grant Date Fair Value Per Share (in dollars per share) $ 8.26 $ 10.69
Number of shares each deferred stock unit will convert to upon the earlier of the separation date of the grantee or the second anniversary of the grant date 1  
Compensation expense recognized $ 0.8 $ 1.0