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Significant Accounting Policies - Deferred Leasing Commissions and Revenue Recognition (Details)
 3 Months Ended 12 Months Ended
Dec. 31, 2015
USD ($)
shares
Sep. 30, 2015
shares
Jun. 30, 2015
shares
Mar. 31, 2015
shares
Dec. 31, 2014
shares
Sep. 30, 2014
shares
Jun. 30, 2014
shares
Mar. 31, 2014
shares
Dec. 31, 2015
USD ($)
item
shares
Dec. 31, 2014
USD ($)
shares
Dec. 31, 2013
USD ($)
shares
Deferred Leasing Commissions                      
Amortization of deferred leasing commissions                 $ 5,680,000 $ 5,786,000 $ 4,683,000
Estimated annual amortization of deferred leasing commissions for the succeeding five years                      
2016                 6,105,000    
2017                 5,372,000    
2018                 4,481,000    
2019                 3,810,000    
2020                 3,072,000    
2021 and thereafter                 6,159,000    
Summary of rental revenue                      
Income from leases                 185,738,000 189,508,000 159,472,000
Reimbursable expenses                 49,512,000 49,731,000 41,486,000
Straight-line rent adjustment                 2,448,000 4,737,000 5,755,000
Amortization of favorable and unfavorable leases                 158,000 (635,000) 213,000
Rental revenue                 $ 237,856,000 $ 243,341,000 $ 206,926,000
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 100,187,000 100,187,000 100,187,000 100,187,000 100,187,000 100,187,000 100,187,000 100,187,000 100,187,000 100,187,000 93,855,000
Derivative instruments                      
Fair value hedges outstanding $ 0               $ 0