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Equity Incentive Programs (Deferred Stock Unit Activity) (Details) - Deferred Stock Units (DSUs)
 9 Months Ended
Sep. 30, 2020
$ / shares
shares
Units  
Outstanding at beginning of period (in shares) 314,658
Granted (in shares) 204,088
Dividend equivalents granted (in shares) 21,145
Settled (in shares) (38,930)
Outstanding at end of period (in shares) 500,961
Weighted-Average Grant Date Fair Value Per Share  
Outstanding at beginning of period (in dollars per share) | $ / shares $ 16.22
Granted (in dollars per share) | $ / shares 4.67
Dividend equivalents granted (in dollars per share) | $ / shares 3.40
Settled (in dollars per share) | $ / shares 19.81
Outstanding at end of period (in dollars per share) | $ / shares $ 10.69
Number of DSU to class A common share conversion (in shares) 1