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Condensed Consolidated Statements of Income - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Revenues:    
Rental revenue $ 117,113 $ 114,908
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
Operating expenses:    
Property operating expenses 42,210 39,104
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 benefit 468 542
Net income 19,145 16,705
Private perpetual preferred unit distributions (234) (234)
Net income attributable to common unitholders $ 18,911 $ 16,471
Total weighted average units:    
Basic (in units) 296,388 266,134
Diluted (in units) 297,962 266,134
Earnings per unit attributable to common unitholders:    
Basic earnings (in dollars per unit) $ 0.06 $ 0.06
Diluted earnings (in dollars per unit) 0.06 0.06
Dividends per unit (in dollars per unit) $ 0.105 $ 0.085