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Shareholders' Equity / Partners' Capital Shareholders' Equity / Partners' Capital - Noncash Share-Based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Allocated share-based compensation expense | $ 1,288 | $ 832 | $ 3,509 | $ 2,750
General and Administrative Expense |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Allocated share-based compensation expense | 938 | 491 | 2,520 | 1,609
Property Management Expense |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Allocated share-based compensation expense | $ 350 | $ 341 | $ 989 | $ 1,141

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