Fair Value Measurements - Narrative (Details) - Property
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6 Months Ended |
|
Jun. 30, 2019 |
Dec. 31, 2018 |
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Impairment of lease, expiration period (or less) |
60 days
|
|
| Number of long-lived assets held and used accounted for at fair value |
7
|
8
|
| Number of long-lived assets held for sale accounted for fair value |
1
|
1
|
| Fair Value Estimated Using Ground Lease |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Number of long-lived assets held and used accounted for at fair value |
|
3
|
| Fair Value Estimated Using Comparable Properties |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Number of held and used property accounted for at fair value |
4
|
|
| Fair Value Estimated Using Listing Price or Broker Opinion of Value |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Number of held and used property accounted for at fair value |
3
|
5
|