Fair Value Measurements - Carrying Value and Fair Value Measurements (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Level 2 | Carrying Value | Senior Unsecured Notes, net
Liabilities:
Debt instrument, fair value	$ 4,513,243	$ 4,390,189
Level 2 | Fair Value | Senior Unsecured Notes, net
Liabilities:
Debt instrument, fair value	4,856,950	4,682,432
Level 3 | Carrying Value | Non-recourse mortgage, net
Liabilities:
Debt instrument, fair value	1,234,197	1,462,487
Level 3 | Fair Value | Non-recourse mortgage, net
Liabilities:
Debt instrument, fair value	$ 1,240,191	$ 1,487,892