Mortgage Notes Payable (Schedule Of Mortgage Notes Payable) (Details) (USD $)	1 Months Ended			3 Months Ended	12 Months Ended	1 Months Ended
	Jan. 31, 2013 item	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 5.45% Mortgage Note [Member] sqft	Dec. 31, 2013 5.45% Mortgage Note [Member] sqft	Jan. 31, 2013 Two Repaid Mortgage Notes [Member]
Debt Instrument [Line Items]
Interest rate				5.45%	5.45%	5.60%
Net book value of secured property				$ 435,600,000
Mortgage note due date				Dec. 01, 2016
Mortgage notes payable, carrying amount		250,000,000	250,000,000	250,000,000	250,000,000
Secured by square feet of real estate facilities				4,800,000	4,800,000
Number of mortgage notes repaid	2
Mortgage note repayment amount						$ 18,100,000