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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accounting Policies [Abstract]      
Maturity of liquid investments three months or less    
Allowance for doubtful accounts receivable $ 545 $ 310  
Deferred rent receivable allowance amount $ 1,444 1,557  
Minimum percentage of taxable income to be distributed 90.00%    
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]      
Restricted Cash $ 7,271 25,336 $ 11,602
Prepayments of Penalties Associated with Retirement of Debt $ 0 1,453 554
Capitalized Initial Direct Costs $ 0.01    
Operating Lease, Asset $ 12,500    
Operating Lease, Liability 12,500    
In-Place Leases and Tenant Relationships      
Finite-Lived Intangible Assets [Line Items]      
Amortization of Intangible Assets 6,267 6,648 6,717
Above and Below Market Leases      
Finite-Lived Intangible Assets [Line Items]      
Amortization of Intangible Assets $ 1,095 $ 1,116 $ 996