Commitments And Contingencies (Other) (Narrative) (Details) $ in Thousands |
12 Months Ended | |||
|---|---|---|---|---|
|
Dec. 31, 2017
USD ($)
property
|
Dec. 31, 2016
USD ($)
|
Dec. 31, 2015
USD ($)
|
Aug. 31, 2017
USD ($)
|
|
| Commitments And Contingencies [Line Items] | ||||
| Purchase price of property | $ 90,068 | $ 121,582 | $ 94,073 | |
| Notes Receivable 5.85 Interest Rate [Member] | ||||
| Commitments And Contingencies [Line Items] | ||||
| Notes receivable | $ 45,700 | $ 44,700 | ||
| Interest rate | 5.85% | |||
| Purchase price of property | $ 73,000 | |||
| Property Lock-Ups Expired [Member] | ||||
| Commitments And Contingencies [Line Items] | ||||
| Number of properties | property | 80 | |||
| Properties aggregate net book value | $ 1,000,000 | |||