Summary of Significant Accounting Policies - Notes Receivable (Textual) (Details) - USD ($) $ in Thousands	Jun. 26, 2018	Dec. 31, 2018		Dec. 31, 2017	Jan. 20, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable		$ 47,800		$ 3,500
Debt, net		$ 365,707		$ 766,420
1919 Ventures [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Debt, net	$ 44,400
Loan interest rate	4.00%
Mortgage loans scheduled maturity date	Jun. 25, 2023
Ownership percentage	50.00%	50.00%	[1],[2]		50.00%
Note receivable	$ 44,400

[1] The basis difference associated with this venture is allocated between cost and the underlying equity in the net assets of the investee and is accounted for as if the entity were consolidated (i.e., allocated to the Company’s relative share of assets and liabilities with an adjustment to recognize equity in earnings for the appropriate depreciation/amortization).

[2] Ownership percentage represents the Company’s entitlement to residual distributions after payments of priority returns, where applicable.