Recent Transactions (Other Investments) (Narrative) (Details) $ in Thousands |
12 Months Ended | |||
|---|---|---|---|---|
|
Apr. 26, 2016
USD ($)
|
Dec. 31, 2016
USD ($)
ft²
item
|
Dec. 31, 2015
USD ($)
|
Dec. 31, 2014
USD ($)
|
|
| Real Estate Properties [Line Items] | ||||
| Purchase price of property | $ | $ 121,582 | $ 94,073 | $ 91,813 | |
| Weehawken, New Jersey [Member] | ||||
| Real Estate Properties [Line Items] | ||||
| Purchase price of property | $ | $ 36,400 | |||
| Port Imperial 4/5 Garage And Retail [Member] | Projects Under Development And Developable Land [Member] | ||||
| Real Estate Properties [Line Items] | ||||
| Number of units | item | 1,100 | |||
| Area of property (in square feet) | ft² | 290,000 | |||
| Percentage of interest in venture | 52.50% | |||
| Port Imperial South 11 [Member] | Weehawken, New Jersey [Member] | ||||
| Real Estate Properties [Line Items] | ||||
| Number of units | item | 295 | |||