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Fair Value of Assets and Liabilities - Narrative (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 USD ($) debt_security property | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) debt_security property | Jun. 30, 2018 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Impairment of assets | $ 2,213 | $ 548 | $ 8,419 | $ 548
Fair Value, Inputs, Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair value measurement, number of debt securities | debt_security | 2 |  | 2 |
Fair Value, Inputs, Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair value measurement, number of debt securities | debt_security | 4 |  | 4 |
Discontinued Operations, Held-for-sale |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Number of real estate properties held for sale | property | 22 |  | 22 |
Discontinued Operations, Held-for-sale | Nonrecurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Impairment of assets | $ 2,117 |  | $ 8,323 |
Number of real estate properties held for sale | property | 15 |  | 15 |
Sale price less estimated cost to sell | $ 7,613 |  | $ 7,613 |

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