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Significant Accounting Policies (Details 6) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
item
Dec. 31, 2012
Dec. 31, 2011
Deferred Leasing Commissions                      
Amortization of deferred leasing commissions                 $ 4,683,000 $ 4,173,000 $ 3,806,000
Estimated annual amortization of deferred leasing commissions for the succeeding five years                      
2014                 5,240,000    
2015                 4,669,000    
2016                 4,193,000    
2017                 3,312,000    
2018                 2,945,000    
2019 and thereafter                 7,476,000    
Summary of rental revenue                      
Income from leases                 159,472,000 116,494,000 98,080,000
Reimbursable expenses                 41,486,000 29,847,000 26,006,000
Straight-line rent adjustment                 5,755,000 4,366,000 9,863,000
Amortization of favorable and unfavorable leases                 213,000 (273,000) (3,000)
Rental revenue                 206,926,000 150,434,000 133,946,000
Segment Reporting                      
Number of reporting segments                 1    
Net Income Per Share                      
Potential dilutive shares outstanding                 0 0 0
Denominator used for calculating basic and diluted net income per share (in shares) 100,187,000 100,187,000 91,847,000 82,937,000 82,937,000 82,937,000 82,937,000 82,937,000 93,855,000 82,937,000 81,857,000
Derivative instruments                      
Fair value hedges outstanding $ 0               $ 0