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Real Estate Investments (Details) $ in Thousands, ft² in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) ft² site | Dec. 31, 2017 USD ($) ft² | Dec. 31, 2016 USD ($)
Real Estate Properties [Line Items] |  |  |
Number of Real Estate Properties | 645 | 436 |
Net Rentable Area | ft² | 11.2 | 8.7 |
Real Estate Investment Property, Net, Total | $ 1,661,334 | $ 1,214,016 |
Deferred Revenue | 4,627 | 1,837 |
Operating Leases, Rent Expense | 645 | 653 | $ 653
Proceeds from Sale of Real Estate | 65,800 | 44,300 | 27,900
Gains (Losses) on Sales of Investment Real Estate | 11,200 | 14,200 | 10,000
Provision for impairment | $ (2,319) | $ 0 | $ 0
Sixteen Development And Pcs Projects [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Number of Development and Partner Capital Solutions Projects Construction | site | 16 |  |
2018 Business Acquisition [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Retail Net Lease Assets Purchased | 225 |  |
Contingent consideration | $ 0 |  |
2018 Business Acquisition [Member] | Two Hundred Twenty Five Retail Net Lease Assets [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Payments to Acquire Property, Plant, and Equipment | $ 608,300 |  |
Number Of States Properties Located | 37 |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (in year) | 12 years 4 months 24 days |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Land | $ 164,700 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Buildings | 325,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | 118,600 |  |
2017 Business Acquisition [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Retail Net Lease Assets Purchased |  | 79 |
Contingent consideration |  | $ 0 |
2017 Business Acquisition [Member] | Seventy Nine Retail Net Lease Assets [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Payments to Acquire Property, Plant, and Equipment |  | $ 338,000 |
Number Of States Properties Located |  | 27 |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (in year) |  | 11 years 1 month 6 days |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Land |  | $ 94,100 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Buildings |  | 172,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  | $ 71,900 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt | $ 21,500 |  |

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