Commitments And Contingencies (Tax Abatement Agreements) (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Apr. 01, 2015
Commitments And Contingencies [Line Items]
Total project costs			$ 92,500,000
Harborside Financial Center Plaza 4A [Member]
Commitments And Contingencies [Line Items]
Project period	20 years
Percentage of PILOT on project costs	2.00%
Total project costs	$ 49,500,000
Payments in lieu of property taxes (PILOT)	$ 247,000	$ 247,000
Harborside Financial Center Plaza 5 [Member]
Commitments And Contingencies [Line Items]
Project period	20 years
Percentage of PILOT on project costs	2.00%
Total project costs	$ 170,900,000
Payments in lieu of property taxes (PILOT)	$ 854,000	$ 854,000
Port Imperial South 4/5 [Member]
Commitments And Contingencies [Line Items]
Project period	5 years
Period of real estate taxes phase in	5 years