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Real Estate Investments (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 USD ($) ft² state | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) ft² site property state | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) ft² state
Real Estate Properties [Line Items] |  |  |  |  |
Number of Real Estate Properties | 789 |  | 789 |  | 645
Number of states | state | 46 |  | 46 |  | 46
Land Subject to Ground Leases | ft² | 14,000,000.0 |  | 14,000,000.0 |  | 11,200,000
Net Real Estate Investments | $ 2,118,928,000 |  | $ 2,118,928,000 |  | $ 1,661,334,000
Number of Development and Partner Capital Solutions Projects Construction | 4 |  | 2 |  |
Number of properties sold | 3 |  | 9 |  |
Proceeds from Sale of Real Estate | $ 7,700,000 |  | $ 34,500,000 |  |
Gains (Losses) on Sales of Investment Real Estate | 2,600,000 |  | 9,000,000.0 |  |
Impairment of Long-Lived Assets Held-for-use | 0 | $ 488,000 | 1,609,000 | $ 1,651,000 |
Impaired Real Estate Estate Fair Value | 3,000,000.0 |  | 3,000,000.0 |  |
Business Acquisition 2019 [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Payments to Acquire Property, Plant, and Equipment | $ 246,400,000 |  | $ 565,000,000.0 |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (in year) | 12 years 3 months 18 days |  | 11 years 10 months 24 days |  |
Retail Net Lease Assets Purchased | 68 |  | 147 |  |
Number Of States Properties Located | 27 |  | 37 |  |
Number of Contracts or Customers Comprising Ten Percent or More Of Company's Total Assets or Total Rent |  |  | 0 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Land | $ 165,200,000 |  | $ 165,200,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Buildings | 323,100,000 |  | 323,100,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | $ 76,700,000 |  | $ 76,700,000 |  |

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