Components of Rental Income and Expense (Components Of Rental Expenses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Components Of Rental Income and Expense [Abstract]
Repairs and maintenance	$ 62,420	$ 55,444	$ 46,600
Utilities	23,003	20,499	19,219
Management fees and costs	18,639	17,416	16,250
Payroll	12,673	11,554	9,237
Marketing	9,046	9,532	8,664
Insurance	7,875	6,462	6,811
Ground Rent	2,540	1,952	1,916
Bad debt expense	1,168	2,021	442
Other operating	10,229	10,537	9,556
Total rental expenses	$ 147,593	$ 135,417	$ 118,695