Earnings Per Common Share (Narrative) (Details) - shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive awards excluded from computation of diluted earnings per share (shares)			500,000
Contingently issuable share excluded (shares)	0	0	0
Performance-vested awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive awards excluded from computation of diluted earnings per share (shares)	300,000	700,000
Time vested awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive awards excluded from computation of diluted earnings per share (shares)	0	0	0