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Other Significant Events (Details) $ in Thousands	3 Months Ended		6 Months Ended
Other Significant Events (Details) $ in Thousands	Jun. 30, 2018 USD ($) tenant property	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) tenant property	Jun. 30, 2017 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for Doubtful Accounts	$ 5,641	$ 409	$ 5,376	$ 1,707
Tenant One [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provisions for bad debts, increase (decrease)	$ 7,000
Number Of tenants \| tenant	1		1
Tenant Two [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provisions for bad debts, increase (decrease)	$ (1,700)		$ (1,400)
Number of properties \| property	1		1