Summary Of Significant Accounting Policies (Utility Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accounting Policies [Abstract]
Utility related taxes	$ 57,745	$ 59,173	$ 58,250
Real Estate Tax Expense	38,505	35,948	33,932
Other Taxes	2,485	2,536	2,118
Utilities Operating Expense, Taxes	$ 98,735	$ 97,657	$ 94,300