Common Share Capitalization (Summary Of Common Shares Outstanding) (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Shares Outstanding, period begin	30,149,880	32,112,697	31,335,938	32,294,703
Shares repurchased	0	(123,321)	(1,186,058)	(305,327)
Director LTIP Units exercised	3,334	2,801	3,334	2,801
Shares issued in connection with incentive fee payment	1,841	0	1,841	0
Common Shares Outstanding, period end	30,155,055	31,992,177	30,155,055	31,992,177