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Consolidated Statements of Income - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Revenues:      
Rental revenue $ 586,414    
Rental revenue   $ 493,231 $ 483,944
Tenant expense reimbursement 0 72,372 73,679
Observatory revenue 128,769 131,227 127,118
Lease termination fees 4,352 20,847 13,551
Third-party management and other fees 1,254 1,440 1,400
Other revenue and fees 10,554 12,394 9,834
Total revenues 731,343 731,511 709,526
Operating expenses:      
Property operating expenses 174,977 167,379 163,531
Ground rent expense 9,326 9,326 9,326
General and administrative expenses 61,063 52,674 50,315
Observatory expenses 33,767 32,767 30,275
Real estate taxes 115,916 110,000 102,466
Depreciation and amortization 181,588 168,508 160,710
Total operating expenses 576,637 540,654 516,623
Total operating income 154,706 190,857 192,903
Other income (expense):      
Interest income 11,259 10,661 2,942
Interest expense (79,246) (79,623) (68,473)
Loss on early extinguishment of debt 0 0 (2,157)
Loss from derivative financial instruments 0 0 (289)
Income before income taxes 86,719 121,895 124,926
Income tax expense (2,429) (4,642) (6,673)
Net income 84,290 117,253 118,253
Private perpetual preferred unit distributions (1,743) (936) (936)
Net income attributable to common unitholders $ 82,547 $ 116,317 $ 117,317
Total weighted average units:      
Basic (in units) 297,798 297,258 296,455
Diluted (in units) 297,798 297,259 298,049
Net income per unit:      
Basic net income per unit (in dollars per unit) $ 0.27 $ 0.39 $ 0.39
Diluted net income per unit (in dollars per unit) $ 0.27 $ 0.39 $ 0.39