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Segment Reporting - Segment Revenue and Profit or Loss Reconciliation (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Reconciliation of Revenue and Profit or Loss from Segments to Consolidated [Line Items]      
Rental revenue $ 114,908 $ 110,058  
Intercompany rental revenue 0 0  
Tenant expense reimbursement 18,120 18,200  
Observatory revenue 21,181 18,223  
Construction revenue 0 1,607  
Third-party management and other fees 545 446  
Other revenue and fees 2,320 3,348  
Total revenues 157,074 151,882  
Property operating expenses 39,104 42,027  
Intercompany rent expense 0 0  
Ground rent expenses 2,333 2,331  
General and administrative expenses 10,918 9,100  
Observatory expenses 7,755 7,402  
Construction expenses 0 2,869  
Real estate taxes 23,525 22,978  
Acquisition expenses 98 0  
Depreciation and amortization 39,227 41,418  
Total operating expenses 122,960 128,125  
Total operating income 34,114 23,757  
Interest expense (17,951) (16,047)  
Income before income taxes 16,163 7,710  
Income tax benefit (expense) 542 178  
Net income 16,705 7,888  
Segment assets 3,263,371 3,272,988 $ 3,300,650
Expenditures for segment assets 23,458 37,393  
Intersegment Elimination      
Reconciliation of Revenue and Profit or Loss from Segments to Consolidated [Line Items]      
Rental revenue 0 0  
Intercompany rental revenue (13,718) (11,664)  
Tenant expense reimbursement 0 0  
Observatory revenue 0 0  
Construction revenue   (2,315)  
Third-party management and other fees 0 0  
Other revenue and fees 0 0  
Total revenues (13,718) (13,979)  
Property operating expenses 0 0  
Intercompany rent expense (13,718) (11,664)  
Ground rent expenses 0 0  
General and administrative expenses 0 0  
Observatory expenses 0 0  
Construction expenses   (2,104)  
Real estate taxes 0 0  
Acquisition expenses 0    
Depreciation and amortization 0 0  
Total operating expenses (13,718) (13,768)  
Total operating income 0 (211)  
Interest expense 0 0  
Income before income taxes 0 (211)  
Income tax benefit (expense) 0 0  
Net income 0 (211)  
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 114,908 110,058  
Intercompany rental revenue 13,718 11,664  
Tenant expense reimbursement 18,120 18,200  
Observatory revenue 0 0  
Construction revenue   0  
Third-party management and other fees 545 446  
Other revenue and fees 2,320 3,348  
Total revenues 149,611 143,716  
Property operating expenses 39,104 42,027  
Intercompany rent expense 0 0  
Ground rent expenses 2,333 2,331  
General and administrative expenses 10,918 9,100  
Observatory expenses 0 0  
Construction expenses   0  
Real estate taxes 23,525 22,978  
Acquisition expenses 98    
Depreciation and amortization 39,130 41,233  
Total operating expenses 115,108 117,669  
Total operating income 34,503 26,047  
Interest expense (17,951) (16,047)  
Income before income taxes 16,552 10,000  
Income tax benefit (expense) (405) (351)  
Net income 16,147 9,649  
Segment assets 3,015,802 3,017,669  
Expenditures for segment assets 23,458 37,393  
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 21,181 18,223  
Construction revenue   0  
Third-party management and other fees 0 0  
Other revenue and fees 0 0  
Total revenues 21,181 18,223  
Property operating expenses 0 0  
Intercompany rent expense 13,718 11,664  
Ground rent expenses 0 0  
General and administrative expenses 0 0  
Observatory expenses 7,755 7,402  
Construction expenses   0  
Real estate taxes 0 0  
Acquisition expenses 0    
Depreciation and amortization 97 79  
Total operating expenses 21,570 19,145  
Total operating income (389) (922)  
Interest expense 0 0  
Income before income taxes (389) (922)  
Income tax benefit (expense) 947 256  
Net income 558 (666)  
Segment assets 247,569 251,662  
Expenditures for segment assets $ 0 0  
Other | Operating Segments      
Reconciliation of Revenue and Profit or Loss from Segments to Consolidated [Line Items]      
Rental revenue   0  
Intercompany rental revenue   0  
Tenant expense reimbursement   0  
Observatory revenue   0  
Construction revenue   3,922  
Third-party management and other fees   0  
Other revenue and fees   0  
Total revenues   3,922  
Property operating expenses   0  
Intercompany rent expense   0  
Ground rent expenses   0  
General and administrative expenses   0  
Observatory expenses   0  
Construction expenses   4,973  
Real estate taxes   0  
Depreciation and amortization   106  
Total operating expenses   5,079  
Total operating income   (1,157)  
Interest expense   0  
Income before income taxes   (1,157)  
Income tax benefit (expense)   273  
Net income   (884)  
Segment assets   3,657  
Expenditures for segment assets   $ 0