Fair Value Measurements - Schedule of Carrying Amount and Estimated Fair Value Of Financial Instruments (Details) - USD ($) $ in Thousands |
Jun. 30, 2020 |
Dec. 31, 2019 |
|---|---|---|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
| Loans receivable, net | $ 29,163 | $ 34,465 |
| Revolving credit facilities | 116,500 | |
| 2020 Term Loans | 397,824 | |
| Senior Unsecured Notes, net | 1,484,884 | 1,484,066 |
| Mortgages and notes payable, net | 214,338 | 216,049 |
| Convertible Notes, net | 339,462 | 336,402 |
| Estimated Fair Value | ||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
| Loans receivable, net | 29,823 | 35,279 |
| 2019 Credit Facility | 119,802 | |
| 2020 Term Loans | 400,231 | |
| Senior Unsecured Notes, net | 1,455,070 | 1,543,919 |
| Mortgages and notes payable, net | 228,768 | 235,253 |
| Convertible Notes, net | $ 344,597 | $ 356,602 |