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Summary of Significant Accounting Policies - Narrative (Details)
$ in Thousands
3 Months Ended
Jan. 01, 2019
USD ($)
property
Mar. 31, 2019
USD ($)
segment
$ / €
Mar. 31, 2018
USD ($)
Mar. 31, 2019
USD ($)
Mar. 31, 2019
$ / £
Dec. 31, 2018
$ / €
Dec. 31, 2018
USD ($)
Dec. 31, 2018
$ / £
Dec. 31, 2018
£ / $
Dec. 31, 2018
€ / $
Quantifying Misstatement in Current Year Financial Statements [Line Items]                    
Weighted average remaining lease term   8 years 1 month                
Foreign currency exchange rate, tanslation   1.12     1.30 1.14   1.27 1.27 1.14
Uncollectable Lease Receivables   $ 100 $ 100              
Number of reportable segments (segment) | segment   1                
Number of ground leases | property 7                  
Right-of-use asset       $ 50,800            
Operating lease, liability       23,717            
Accumulated deficit       $ (653,956)     $ (615,448)      
Minimum                    
Quantifying Misstatement in Current Year Financial Statements [Line Items]                    
Lease-up period   12 months                
Maximum                    
Quantifying Misstatement in Current Year Financial Statements [Line Items]                    
Lease-up period   18 months                
2015 OPP                    
Quantifying Misstatement in Current Year Financial Statements [Line Items]                    
Requisite service period   2 years 9 months 12 days                
Accounting Standards Update 2016-02                    
Quantifying Misstatement in Current Year Financial Statements [Line Items]                    
Accounts receivable $ 3,400                  
Bad debt reserve 2,200                  
Right-of-use asset 24,000                  
Operating lease, liability 24,000                  
Ground lease intangible 27,000                  
Accounting Standards Update 2017-12                    
Quantifying Misstatement in Current Year Financial Statements [Line Items]                    
Accumulated deficit $ 300