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Mortgage Notes Payable, Net - Schedule of Long-term Debt Instruments (Details) $ in Thousands			6 Months Ended
	Oct. 01, 2019	Feb. 06, 2019	Jun. 30, 2019 USD ($) property	Dec. 31, 2018 USD ($)
Debt Instrument [Line Items]
Mortgage notes payable, net			$ 1,286,033	$ 1,129,807
Mortgage notes payable
Debt Instrument [Line Items]
Encumbered Properties (property) | property			112
Outstanding Loan Amount			$ 1,299,645	1,140,113
Effective Interest Rate			3.20%
Mortgage discount			$ (86)	(569)
Deferred financing costs, net of accumulated amortization			(13,526)	(9,737)
Mortgage notes payable, net			$ 1,286,033	1,129,807
Mortgage notes payable | Finland
Debt Instrument [Line Items]
Percentage fixed interest rate		80.00%	80.00%
Percentage variable interest rate			20.00%
Interest rate spread		1.80%
Mortgage notes payable | Finland | Euribor
Debt Instrument [Line Items]
Interest rate spread			1.40%
Mortgage notes payable | Germany | Euribor
Debt Instrument [Line Items]
Interest rate spread			1.80%
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			23
Outstanding Loan Amount			$ 435,506	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			$ 84,145	0
Effective Interest Rate			1.70%
Mortgage notes payable | EUR | Auchan
Debt Instrument [Line Items]
Encumbered Properties (property) | property			1
Outstanding Loan Amount			$ 9,438	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			$ 6,595	6,637
Effective Interest Rate			1.70%
Mortgage notes payable | EUR | Sagemcom
Debt Instrument [Line Items]
Encumbered Properties (property) | property			1
Outstanding Loan Amount			$ 40,822	41,083
Effective Interest Rate			1.70%
Mortgage notes payable | EUR | Worldline
Debt Instrument [Line Items]
Encumbered Properties (property) | property			1
Outstanding Loan Amount			$ 5,685	5,722
Effective Interest Rate			1.90%
Mortgage notes payable | EUR | DCNS
Debt Instrument [Line Items]
Encumbered Properties (property) | property			1
Outstanding Loan Amount			$ 10,802	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			$ 11,939	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			$ 71,068	71,524
Effective Interest Rate			1.60%
Mortgage notes payable | EUR | Rexam
Debt Instrument [Line Items]
Encumbered Properties (property) | property			0
Outstanding Loan Amount			$ 0	5,876
Effective Interest Rate			0.00%
Mortgage notes payable | EUR | Metro Tonic
Debt Instrument [Line Items]
Encumbered Properties (property) | property			0
Outstanding Loan Amount			$ 0	30,326
Effective Interest Rate			0.00%
Mortgage notes payable | EUR | ID Logistics I
Debt Instrument [Line Items]
Encumbered Properties (property) | property			0
Outstanding Loan Amount			$ 0	4,578
Effective Interest Rate			0.00%
Mortgage notes payable | EUR | Germany
Debt Instrument [Line Items]
Encumbered Properties (property) | property			5
Outstanding Loan Amount			$ 58,561	0
Effective Interest Rate			2.00%
Mortgage notes payable | EUR | DB Luxembourg
Debt Instrument [Line Items]
Encumbered Properties (property) | property			0
Outstanding Loan Amount			$ 0	41,198
Effective Interest Rate			0.00%
Mortgage notes payable | EUR | ING Amsterdam
Debt Instrument [Line Items]
Encumbered Properties (property) | property			0
Outstanding Loan Amount			$ 0	50,353
Effective Interest Rate			0.00%
Mortgage notes payable | EUR | Benelux
Debt Instrument [Line Items]
Encumbered Properties (property) | property			3
Outstanding Loan Amount			$ 136,451	0
Effective Interest Rate			1.40%
Mortgage notes payable | GBP
Debt Instrument [Line Items]
Encumbered Properties (property) | property			43
Outstanding Loan Amount			$ 292,039	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			$ 292,039	292,890
Effective Interest Rate			3.20%
Mortgage notes payable | USD
Debt Instrument [Line Items]
Encumbered Properties (property) | property			46
Outstanding Loan Amount			$ 572,100	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
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%
Mortgage notes payable | USD | Multi-Tenant Mortgage Loan IV
Debt Instrument [Line Items]
Encumbered Properties (property) | property			16
Outstanding Loan Amount			$ 97,500	$ 0
Effective Interest Rate			4.60%
Forecast | Mortgage notes payable | Germany | Euribor
Debt Instrument [Line Items]
Interest rate spread	1.55%

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