Fair Value Measurements - Schedule of Fair Value (Details) - Mortgage Debt - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Fair Value | AIG Loan
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt fair value	$ 120,805	$ 120,599
Fair Value | BofA/KeyBank Loan
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt fair value	256,299	249,566
Carrying Value | AIG Loan
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt fair value	126,970	126,970
Carrying Value | BofA/KeyBank Loan
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt fair value	$ 250,000	$ 250,000