Acquisition of Real Estate (Properties Acquired) (Details) $ in Thousands |
3 Months Ended |
|---|---|
|
Mar. 31, 2017
USD ($)
ft²
| |
| Business Acquisition [Line Items] | |
| GLA | ft² | 409,296 |
| Aggregate Purchase Price | $ 104,811 |
| Outparcel building adjacent to Annex of Arlington | |
| Business Acquisition [Line Items] | |
| GLA | ft² | 5,760 |
| Aggregate Purchase Price | $ 1,006 |
| Outparcel adjacent to Northeast Plaza | |
| Business Acquisition [Line Items] | |
| Aggregate Purchase Price | $ 1,537 |
| Arborland Center | |
| Business Acquisition [Line Items] | |
| GLA | ft² | 403,536 |
| Aggregate Purchase Price | $ 102,268 |