Earnings/(Loss) Per Common Share (Schedule Of Anti-Dilutive Securities) (Details) - shares	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share	1,080,373	1,659,134
8.00% Contingent Convertible Senior Notes (2017 Convertible Note) [Member]
Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share	1,034,483	1,034,483
8.00% Contingent Convertible Senior Notes (2013 Convertible Notes) [Member]
Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share		565,469
Restricted Common Stock [Member]
Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share	30,466	44,176
Restricted Operatnig LLC Units [Member]
Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share	15,424	15,006