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Acquired Intangibles Assets and Liabilities (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Finite-lived intangible assets    
Gross Carrying Value $ 158,867 $ 158,867
Accumulated Amortization (53,917) (49,416)
Net Carrying Value 104,950 109,451
Acquired below market leases - as Lessor    
Gross Carrying Value 809 809
Accumulated Amortization (434) (375)
Net Carrying Value 375 434
Acquired above market leases - as Lessee    
Gross Carrying Value 2,453 2,453
Accumulated Amortization (604) (550)
Net Carrying Value 1,849 1,903
Acquired Intangible Liabilities    
Acquired intangible liabilities 17,009 17,009
Accumulated Amortization (4,070) (3,755)
New Carrying Value $ 12,939 $ 13,254
Minimum    
Acquired below market leases - as Lessor    
Useful Lives 3 years 3 years
Acquired above market leases - as Lessee    
Useful Lives 11 years 11 years
Maximum    
Acquired below market leases - as Lessor    
Useful Lives 4 years 4 years
Acquired above market leases - as Lessee    
Useful Lives 12 years 12 years
Customer Relationships    
Finite-lived intangible assets    
Gross Carrying Value $ 95,705 $ 95,705
Accumulated Amortization (22,500) (20,512)
Net Carrying Value $ 73,205 $ 75,193
Customer Relationships | Minimum    
Finite-lived intangible assets    
Useful Lives 1 year 1 year
Customer Relationships | Maximum    
Finite-lived intangible assets    
Useful Lives 12 years 12 years
In Place Leases    
Finite-lived intangible assets    
Gross Carrying Value $ 32,066 $ 32,066
Accumulated Amortization (14,213) (12,987)
Net Carrying Value $ 17,853 $ 19,079
In Place Leases | Minimum    
Finite-lived intangible assets    
Useful Lives 6 months 6 months
In Place Leases | Maximum    
Finite-lived intangible assets    
Useful Lives 10 years 10 years
Solar Power Agreement    
Finite-lived intangible assets    
Useful Lives 17 years 17 years
Gross Carrying Value $ 13,747 $ 13,747
Accumulated Amortization (3,032) (2,830)
Net Carrying Value $ 10,715 $ 10,917
Platform Intangible    
Finite-lived intangible assets    
Useful Lives 3 years 3 years
Gross Carrying Value $ 9,600 $ 9,600
Accumulated Amortization (8,762) (8,133)
Net Carrying Value 838 1,467
Acquired favorable leases    
Finite-lived intangible assets    
Gross Carrying Value 4,649 4,649
Accumulated Amortization (2,581) (2,328)
Net Carrying Value $ 2,068 $ 2,321
Acquired favorable leases | Minimum    
Finite-lived intangible assets    
Useful Lives 6 months 6 months
Acquired favorable leases | Maximum    
Finite-lived intangible assets    
Useful Lives 8 years 8 years
Tradenames    
Finite-lived intangible assets    
Useful Lives 3 years 3 years
Gross Carrying Value $ 3,100 $ 3,100
Accumulated Amortization (2,829) (2,626)
Net Carrying Value $ 271 $ 474