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Segment Reporting - Segment Revenue and Profit or Loss Reconciliation (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Reconciliation of Revenue and Profit or Loss from Segments to Consolidated [Line Items]      
Rental revenue $ 117,113 $ 114,908  
Intercompany rental revenue 0 0  
Tenant expense reimbursement 15,974 18,120  
Observatory revenue 20,940 21,181  
Third-party management and other fees 351 545  
Other revenue and fees 10,576 2,320  
Total revenues 164,954 157,074  
Property operating expenses 42,210 39,104  
Intercompany rent expense 0 0  
Ground rent expenses 2,331 2,333  
General and administrative expenses 11,088 10,918  
Observatory expenses 7,255 7,755  
Real estate taxes 24,558 23,525  
Acquisition expenses 0 98  
Depreciation and amortization 40,846 39,227  
Total operating expenses 128,288 122,960  
Total operating income 36,666 34,114  
Other expense:      
Interest expense (17,742) (17,951)  
Loss from derivative financial instruments (247) 0  
Income before income taxes 18,677 16,163  
Income tax (expense) benefit 468 542  
Net income 19,145 16,705  
Segment assets 3,866,176 3,263,371 $ 3,890,953
Expenditures for segment assets 48,060 23,458  
Intersegment Elimination      
Reconciliation of Revenue and Profit or Loss from Segments to Consolidated [Line Items]      
Rental revenue 0 0  
Intercompany rental revenue (13,378) (13,718)  
Tenant expense reimbursement 0 0  
Observatory revenue 0 0  
Third-party management and other fees 0 0  
Other revenue and fees 0 0  
Total revenues (13,378) (13,718)  
Property operating expenses 0 0  
Intercompany rent expense (13,378) (13,718)  
Ground rent expenses 0 0  
General and administrative expenses 0 0  
Observatory expenses 0 0  
Real estate taxes 0 0  
Acquisition expenses   0  
Depreciation and amortization 0 0  
Total operating expenses (13,378) (13,718)  
Total operating income 0 0  
Other expense:      
Interest expense 0 0  
Loss from derivative financial instruments 0    
Income before income taxes 0 0  
Income tax (expense) benefit 0 0  
Net income 0 0  
Segment assets 0 0  
Expenditures for segment assets 0 0  
Real Estate | Operating Segments      
Reconciliation of Revenue and Profit or Loss from Segments to Consolidated [Line Items]      
Rental revenue 117,113 114,908  
Intercompany rental revenue 13,378 13,718  
Tenant expense reimbursement 15,974 18,120  
Observatory revenue 0 0  
Third-party management and other fees 351 545  
Other revenue and fees 10,576 2,320  
Total revenues 157,392 149,611  
Property operating expenses 42,210 39,104  
Intercompany rent expense 0 0  
Ground rent expenses 2,331 2,333  
General and administrative expenses 11,088 10,918  
Observatory expenses 0 0  
Real estate taxes 24,558 23,525  
Acquisition expenses   98  
Depreciation and amortization 40,833 39,130  
Total operating expenses 121,020 115,108  
Total operating income 36,372 34,503  
Other expense:      
Interest expense (17,742) (17,951)  
Loss from derivative financial instruments (247)    
Income before income taxes 18,383 16,552  
Income tax (expense) benefit (283) (405)  
Net income 18,100 16,147  
Segment assets 3,617,276 3,015,802  
Expenditures for segment assets 48,054 23,458  
Observatory | Operating Segments      
Reconciliation of Revenue and Profit or Loss from Segments to Consolidated [Line Items]      
Rental revenue 0 0  
Intercompany rental revenue 0 0  
Tenant expense reimbursement 0 0  
Observatory revenue 20,940 21,181  
Third-party management and other fees 0 0  
Other revenue and fees 0 0  
Total revenues 20,940 21,181  
Property operating expenses 0 0  
Intercompany rent expense 13,378 13,718  
Ground rent expenses 0 0  
General and administrative expenses 0 0  
Observatory expenses 7,255 7,755  
Real estate taxes 0 0  
Acquisition expenses   0  
Depreciation and amortization 13 97  
Total operating expenses 20,646 21,570  
Total operating income 294 (389)  
Other expense:      
Interest expense 0 0  
Loss from derivative financial instruments 0    
Income before income taxes 294 (389)  
Income tax (expense) benefit 751 947  
Net income 1,045 558  
Segment assets 248,900 247,569  
Expenditures for segment assets $ 6 $ 0