Related Party Transactions and Arrangements - Asset Management Agreement (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
May 31, 2018 |
Jun. 30, 2018 |
Jun. 30, 2017 |
Jun. 30, 2018 |
Jun. 30, 2017 |
|
| Related Party Transaction [Line Items] | |||||
| Related party fee income | $ 2,219 | $ 0 | $ 2,219 | $ 0 | |
| Affiliated entity | Asset management agreement | |||||
| Related Party Transaction [Line Items] | |||||
| Annual management revenue in related party transaction | $ 20,000 | ||||
| Related party fee income | 1,700 | 1,700 | |||
| Due from related parties | $ 1,700 | $ 1,700 | |||