Fair Value Measurements - Fair Value Inputs of Long-Lived Assets Held for Sale (Details) - Fair Value Estimated Using Signed Purchase and Sale Agreement - Retail |
Jun. 30, 2019
ft²
$ / ft²
|
Dec. 31, 2018
ft²
$ / ft²
|
|---|---|---|
| Measurement Input, Price Per Square Foot | ||
| Long Lived Assets Held-for-sale [Line Items] | ||
| Long-lived assets held for sale, measurement input | 73.01 | 126.73 |
| Measurement Input, Price Per Square Foot | Weighted Average | ||
| Long Lived Assets Held-for-sale [Line Items] | ||
| Long-lived assets held for sale, measurement input | 73.01 | 126.73 |
| Measurement Input, Square Footage | ||
| Long Lived Assets Held-for-sale [Line Items] | ||
| Long-lived assets held for sale, measurement input | ft² | 6,840 | 63,128 |