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Self Administration Transaction - Narrative (Details) $ / shares in Units, $ in Thousands, shares in Millions | Dec. 14, 2018 USD ($) contingency $ / shares shares | Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($)
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill |  | $ 229,948 | $ 229,948
GRECO |  |  |
Business Acquisition [Line Items] |  |  |
Ownership interest acquired (percent) | 100.00% |  |
OP units issued (shares) | shares | 20.4 |  |
Fair value per unit of OP units issued (in usd per share) | $ / shares | $ 10.03 |  |
Number of earn-outs | contingency | 2 |  |
Fair value of earn-outs | $ 29,380 |  |
Goodwill | $ 229,948 |  |

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