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Significant Accounting Policies - Deferred Leasing Commissions and Revenue Recognition (Details)
 3 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
shares
Sep. 30, 2016
shares
Jun. 30, 2016
shares
Mar. 31, 2016
shares
Dec. 31, 2015
USD ($)
shares
Sep. 30, 2015
shares
Jun. 30, 2015
shares
Mar. 31, 2015
shares
Dec. 31, 2016
USD ($)
item
shares
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2014
USD ($)
shares
Deferred Leasing Commissions                      
Amortization of deferred leasing commissions                 $ 6,272,000 $ 5,680,000 $ 5,786,000
Estimated annual amortization of deferred leasing commissions for the succeeding five years                      
2017                 6,605,000    
2018                 6,136,000    
2019                 5,232,000    
2020                 4,571,000    
2021                 3,928,000    
2021 and thereafter                 8,232,000    
Summary of rental revenue                      
Income from leases                 192,055,000 185,738,000 189,508,000
Reimbursable expenses                 49,821,000 49,512,000 49,731,000
Straight-line rent adjustment                 1,977,000 2,448,000 4,737,000
Amortization of favorable and unfavorable leases                 496,000 158,000 (635,000)
Rental revenue                 $ 244,349,000 $ 237,856,000 $ 243,341,000
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 107,231,000 103,709,000 100,187,000 100,187,000 100,187,000 100,187,000 100,187,000 100,187,000 102,843,000 100,187,000 100,187,000
Derivative instruments                      
Fair value hedges outstanding $ 0               $ 0    
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]                      
Debt issuance costs $ 4,783,000       $ 2,353,000       4,783,000 $ 2,353,000  
ASU 2016-02                      
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]                      
Increase in assets and liabilities                 $ 3,000,000