Other Significant Events - Narrative (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($) tenant	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for bad debts		$ 5,685	$ 3,269	$ 0
Provisions for bad debts, increase (decrease)	$ (1,400)
Tenant One [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for bad debts	$ 7,000
Number of tenants | tenant		1