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Summary of Significant Accounting Policies (Textual) (Details)
 3 Months Ended 12 Months Ended
Dec. 21, 2018
USD ($)
Aug. 23, 2018
May 18, 2017
shares
Mar. 15, 2017
USD ($)
ft²
Jul. 01, 2016
USD ($)
a
Dec. 31, 2018
USD ($)
ft²
a
Parcel
Customer
shares
Jun. 30, 2018
USD ($)
Dec. 31, 2016
USD ($)
Customer
Dec. 31, 2018
USD ($)
ft²
a
Parcel
Customer
shares
Dec. 31, 2017
USD ($)
ft²
Customer
Dec. 31, 2016
USD ($)
Customer
Jan. 01, 2019
USD ($)
Dec. 03, 2015
ft²
Accounting Policies [Line Items]                          
Income tax (provision) benefit                 $ (423,000) $ 628,000 $ 0    
Increase in operating cash flows                 14,334,000 (1,752,000) (544,000)    
Variable interest entity, assets           $ 414,300,000     414,300,000 412,900,000      
Variable interest entity, liabilities           254,100,000     254,100,000 250,400,000      
Revenue increased by straight-line rent adjustment                 10,400,000 24,900,000 26,300,000    
Increased revenue due to amortization of deferred rent                 1,800,000 2,200,000 2,100,000    
Decrease in revenue due to amortization of lease incentives                 1,500,000 1,800,000 2,000,000.0    
Lease agreement variable income                 0        
Third Party Management Accounts Receivable Outstanding           $ 1,500,000     $ 1,500,000        
Rentable Square Feet | ft²           1,414,457     1,414,457        
Sales Price           $ 359,300,000     $ 359,300,000        
Proceeds from the sale of properties                 324,090,000 171,860,000 784,331,000    
Assets held for sale, net           11,599,000     11,599,000 392,000      
Gain (Loss) on Sale                 2,932,000 31,657,000 116,983,000    
Gross sales value of office property           $ 359,300,000     359,300,000        
Proceeds from real estate venture sales                 $ 60,346,000 145,416,000 21,022,000    
Common shares for future awards | shares           7,366,306     7,366,306        
Additional shares authorized for issuance | shares     2,663,886                    
Total number of shares authorized for issuance | shares     6,500,000                    
Number of awards granted | shares                 429,434        
Number of awards cancelled | shares                 1,295,740        
Share-based compensation expense                 $ 7,600,000 6,300,000 5,600,000    
Share-based compensation expense, capitalized                 $ 1,600,000 $ 1,200,000 $ 1,000,000.0    
Employee Stock Option And Share Appreciation Rights                          
Accounting Policies [Line Items]                          
Common shares for future awards | shares           964,359     964,359        
Garza Land Acquisition [Member]                          
Accounting Policies [Line Items]                          
Area of land acquired (in acres) | a         34.6                
Aggregate gain recognized           $ 200,000 $ 2,800,000            
Subaru Build-to-Service Center Project [Member]                          
Accounting Policies [Line Items]                          
Rentable Square Feet | ft²                         83,000
Sales Price $ 45,300,000                        
Lease terms                         18 years
Purchase option of lease from inception period   5 years                      
Direct finance lease, interest income                 $ 1,600,000        
Gross sales value of office property 45,300,000                        
Proceeds from real estate venture sales $ 44,900,000                        
Garza Land Sale [Member] | Garza Land Acquisition [Member]                          
Accounting Policies [Line Items]                          
Area of land acquired (in acres) | a         34.6                
Gross purchase value of assets         $ 20,600,000                
Number of Parcels | Parcel           3     3        
Garza Land Sale [Member] | Parcel One [Member] | Garza Land Acquisition [Member]                          
Accounting Policies [Line Items]                          
Area of land sold | a           8.4     8.4        
Garza Land Sale [Member] | Parcel Two [Member] | Garza Land Acquisition [Member]                          
Accounting Policies [Line Items]                          
Area of land sold | a           1.7     1.7        
Garza Land Sale [Member] | Parcel Three [Member] | Garza Land Acquisition [Member]                          
Accounting Policies [Line Items]                          
Area of land sold | a           6.6     6.6        
Garza Land Sale [Member] | Third Party Developers [Member] | Parcel One [Member] | Garza Land Acquisition [Member]                          
Accounting Policies [Line Items]                          
Date of parcels sold                 Jan. 30, 2017        
Garza Land Sale [Member] | Third Party Developers [Member] | Parcel Two [Member] | Garza Land Acquisition [Member]                          
Accounting Policies [Line Items]                          
Date of parcels sold                 Apr. 28, 2017        
Garza Land Sale [Member] | Third Party [Member] | Parcel Three [Member] | Garza Land Acquisition [Member]                          
Accounting Policies [Line Items]                          
Date of parcels sold                 Mar. 16, 2018        
Philadelphia Marine Center (Marine Piers) [Member]                          
Accounting Policies [Line Items]                          
Rentable Square Feet | ft²       181,900           181,900      
Sales Price       $ 21,400,000           $ 21,400,000      
Payment by cash on purchases       12,000,000.0           12,000,000.0      
Proceeds from the sale of properties       11,200,000           11,200,000      
Balance payment on purchase price       $ 9,400,000           $ 9,400,000      
Date of second installment payment       Jan. 31, 2020           Jan. 31, 2020      
Assets held for sale, net       $ 4,700,000           $ 4,700,000      
Gain (Loss) on Sale       6,500,000           6,500,000      
Deferred gain on sale       9,400,000           9,400,000      
Gross sales value of office property       $ 21,400,000           $ 21,400,000      
Customer Concentration Risk [Member] | Rental Revenue [Member]                          
Accounting Policies [Line Items]                          
Number of tenant accounted for 10% or more of the Company's rents | Customer           0   0 0 0 0    
Unconsolidated Real Estate Ventures [Member]                          
Accounting Policies [Line Items]                          
Capitalized interest                 $ 0 $ 400,000 $ 1,900,000    
Minimum [Member]                          
Accounting Policies [Line Items]                          
Buildings and improvements useful life                 5 years        
Tenant Improvements Useful Lives                 1 year        
Lease terms           10 years     10 years        
Maximum [Member]                          
Accounting Policies [Line Items]                          
Buildings and improvements useful life                 55 years        
Tenant Improvements Useful Lives                 16 years        
Lease terms           66 years     66 years        
ASU 2016-18 [Member]                          
Accounting Policies [Line Items]                          
Restricted cash           $ 400,000   $ 700,000 $ 400,000 1,300,000 700,000    
Increase in operating cash flows                   1,300,000 $ 700,000    
ASU No. 2016-02, Leases (Topic 842) [Member] | Scenario Plan [Member]                          
Accounting Policies [Line Items]                          
Lease liabilities                       $ 22,400,000  
Right of use assets                       $ 22,400,000  
Impairment Charges [Member]                          
Accounting Policies [Line Items]                          
Out-of-period error immaterial in current year               $ 1,200,000          
General And Administrative Expense [Member]                          
Accounting Policies [Line Items]                          
Income tax (provision) benefit                   600,000      
Income Tax Expense Benefit [Member]                          
Accounting Policies [Line Items]                          
Reclassification of net income tax provision out of general and administrative expenses into net income tax provision                   $ 600,000