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Significant Accounting Policies - Deferred Leasing Commissions and Revenue Recognition (Details)
 3 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
shares
Sep. 30, 2018
shares
Jun. 30, 2018
shares
Mar. 31, 2018
shares
Dec. 31, 2017
shares
Sep. 30, 2017
shares
Jun. 30, 2017
shares
Mar. 31, 2017
shares
Dec. 31, 2018
USD ($)
item
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
shares
Deferred Leasing Commissions                      
Amortization of deferred leasing commissions                 $ 8,471,000 $ 6,919,000 $ 6,272,000
Estimated annual amortization of deferred leasing commissions for the succeeding five years                      
2019                 8,644,000    
2020                 7,891,000    
2021                 7,055,000    
2022                 5,770,000    
2023                 4,888,000    
2024 and thereafter                 13,344,000    
Summary of rental revenue                      
Income from leases                 202,127,000 205,690,000 192,055,000
Reimbursable expenses                 61,475,000 58,777,000 49,821,000
Straight-line rent adjustment                 (381,000) 1,767,000 1,977,000
Amortization of favorable and unfavorable leases                 556,000 1,031,000 496,000
Rental revenue                 $ 263,777,000 $ 267,265,000 $ 244,349,000
Segment Reporting                      
Number of reporting segments | item                 1    
Net Income Per Share                      
Potential dilutive shares outstanding | shares                 0 0 0
Denominator used for calculating basic and diluted net income per share (in shares) | shares 107,231,000 107,231,000 107,231,000 107,231,000 107,231,000 107,231,000 107,231,000 107,231,000 107,231,000 107,231,000 102,843,000
Derivative instruments                      
Fair value hedges outstanding $ 0               $ 0    
ASU 2016-02                      
Recent Accounting Standards                      
Increase in assets and liabilities                 $ 2,200,000