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Mortgage Notes Payable, Net - Schedule of Long-term Debt Instruments (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($) property	Dec. 31, 2018 USD ($)
Debt Instrument [Line Items]
Mortgage notes payable, net	$ 1,131,072	$ 1,129,807
Mortgage notes payable
Debt Instrument [Line Items]
Encumbered Properties (property) | property	93
Outstanding Loan Amount	$ 1,141,338	1,140,113
Mortgage discount	(458)	(569)
Deferred financing costs, net of accumulated amortization	(9,808)	(9,737)
Mortgage notes payable, net	$ 1,131,072	1,129,807
Effective Interest Rate	3.20%
Mortgage notes payable | Finland
Debt Instrument [Line Items]
Percentage fixed interest rate	80.00%
Percentage variable interest rate	20.00%
Mortgage notes payable | Finland | Euribor
Debt Instrument [Line Items]
Interest rate spread	1.40%
Mortgage notes payable | Quest Diagnostics | LIBOR
Debt Instrument [Line Items]
Interest rate spread	2.00%
Mortgage notes payable | UK Multi-Property Cross Collateralized Loan | LIBOR
Debt Instrument [Line Items]
Interest rate spread	2.00%
Mortgage notes payable | EUR
Debt Instrument [Line Items]
Encumbered Properties (property) | property	20
Outstanding Loan Amount	$ 366,999	372,623
Mortgage notes payable | EUR | Finnair
Debt Instrument [Line Items]
Encumbered Properties (property) | property	0
Outstanding Loan Amount	$ 0	32,501
Effective Interest Rate	0.00%
Mortgage notes payable | EUR | Tokmanni
Debt Instrument [Line Items]
Encumbered Properties (property) | property	0
Outstanding Loan Amount	$ 0	33,159
Effective Interest Rate	0.00%
Mortgage notes payable | EUR | Finland
Debt Instrument [Line Items]
Encumbered Properties (property) | property	5
Outstanding Loan Amount	$ 83,018	0
Effective Interest Rate	1.70%
Mortgage notes payable | EUR | Auchan
Debt Instrument [Line Items]
Encumbered Properties (property) | property	1
Outstanding Loan Amount	$ 9,311	9,498
Effective Interest Rate	1.70%
Mortgage notes payable | EUR | Pole Emploi
Debt Instrument [Line Items]
Encumbered Properties (property) | property	1
Outstanding Loan Amount	$ 6,507	6,637
Effective Interest Rate	1.70%
Mortgage notes payable | EUR | Sagemcom
Debt Instrument [Line Items]
Encumbered Properties (property) | property	1
Outstanding Loan Amount	$ 40,275	41,083
Effective Interest Rate	1.70%
Mortgage notes payable | EUR | Worldline
Debt Instrument [Line Items]
Encumbered Properties (property) | property	1
Outstanding Loan Amount	$ 5,609	5,722
Effective Interest Rate	1.90%
Mortgage notes payable | EUR | DCNS
Debt Instrument [Line Items]
Encumbered Properties (property) | property	1
Outstanding Loan Amount	$ 10,658	10,872
Effective Interest Rate	1.50%
Mortgage notes payable | EUR | ID Logistics II
Debt Instrument [Line Items]
Encumbered Properties (property) | property	2
Outstanding Loan Amount	$ 11,779	12,016
Effective Interest Rate	1.30%
Mortgage notes payable | EUR | Rheinmetall
Debt Instrument [Line Items]
Encumbered Properties (property) | property	0
Outstanding Loan Amount	$ 0	12,130
Effective Interest Rate	0.00%
Mortgage notes payable | EUR | OBI DIY
Debt Instrument [Line Items]
Encumbered Properties (property) | property	0
Outstanding Loan Amount	$ 0	5,150
Effective Interest Rate	0.00%
Mortgage notes payable | EUR | RWE AG
Debt Instrument [Line Items]
Encumbered Properties (property) | property	3
Outstanding Loan Amount	$ 70,116	71,524
Effective Interest Rate	1.60%
Mortgage notes payable | EUR | Rexam
Debt Instrument [Line Items]
Encumbered Properties (property) | property	1
Outstanding Loan Amount	$ 5,761	5,876
Effective Interest Rate	1.80%
Mortgage notes payable | EUR | Metro Tonic
Debt Instrument [Line Items]
Encumbered Properties (property) | property	1
Outstanding Loan Amount	$ 29,729	30,326
Effective Interest Rate	1.70%
Mortgage notes payable | EUR | ID Logistics I
Debt Instrument [Line Items]
Encumbered Properties (property) | property	1
Outstanding Loan Amount	$ 4,487	4,578
Effective Interest Rate	1.00%
Mortgage notes payable | EUR | DB Luxembourg
Debt Instrument [Line Items]
Encumbered Properties (property) | property	1
Outstanding Loan Amount	$ 40,387	41,198
Effective Interest Rate	1.40%
Mortgage notes payable | EUR | ING Amsterdam
Debt Instrument [Line Items]
Encumbered Properties (property) | property	1
Outstanding Loan Amount	$ 49,362	50,353
Effective Interest Rate	1.70%
Mortgage notes payable | GBP
Debt Instrument [Line Items]
Encumbered Properties (property) | property	43
Outstanding Loan Amount	$ 299,739	292,890
Percentage fixed interest rate	80.00%
Mortgage notes payable | GBP | LIBOR
Debt Instrument [Line Items]
Percentage variable interest rate	20.00%
Mortgage notes payable | GBP | UK Multi-Property Cross Collateralized Loan
Debt Instrument [Line Items]
Encumbered Properties (property) | property	43
Outstanding Loan Amount	$ 299,739	292,890
Effective Interest Rate	3.20%
Mortgage notes payable | USD
Debt Instrument [Line Items]
Encumbered Properties (property) | property	30
Outstanding Loan Amount	$ 474,600	474,600
Mortgage notes payable | USD | Quest Diagnostics
Debt Instrument [Line Items]
Encumbered Properties (property) | property	1
Outstanding Loan Amount	$ 52,800	52,800
Effective Interest Rate	4.50%
Mortgage notes payable | USD | AT&T Services
Debt Instrument [Line Items]
Encumbered Properties (property) | property	1
Outstanding Loan Amount	$ 33,550	33,550
Effective Interest Rate	2.00%
Mortgage notes payable | USD | AT&T Services | Adjusted LIBOR
Debt Instrument [Line Items]
Interest rate spread	2.00%
Mortgage notes payable | USD | Penske Logistics
Debt Instrument [Line Items]
Encumbered Properties (property) | property	1
Outstanding Loan Amount	$ 70,000	70,000
Effective Interest Rate	4.70%
Mortgage notes payable | USD | Multi-Tenant Mortgage Loan I (7)
Debt Instrument [Line Items]
Encumbered Properties (property) | property	12
Outstanding Loan Amount	$ 187,000	187,000
Effective Interest Rate	4.40%
Mortgage notes payable | USD | Multi-Tenant Mortgage Loan II
Debt Instrument [Line Items]
Encumbered Properties (property) | property	8
Outstanding Loan Amount	$ 32,750	32,750
Effective Interest Rate	4.40%
Mortgage notes payable | USD | Multi-Tenant Mortgage Loan III
Debt Instrument [Line Items]
Encumbered Properties (property) | property	7
Outstanding Loan Amount	$ 98,500	$ 98,500
Effective Interest Rate	4.90%

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