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Consolidated Statements of Income - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenues:      
Rental revenue $ 493,231 $ 483,944 $ 460,653
Tenant expense reimbursement 72,372 73,679 73,459
Observatory revenue 131,227 127,118 124,814
Lease termination fees 20,847 13,551 7,676
Third-party management and other fees 1,440 1,400 1,766
Other revenue and fees 12,394 9,834 8,985
Total revenues 731,511 709,526 677,353
Operating expenses:      
Property operating expenses 167,379 163,531 153,850
Ground rent expense 9,326 9,326 9,326
General and administrative expenses 52,674 50,315 49,078
Observatory expenses 32,767 30,275 29,833
Real estate taxes 110,000 102,466 96,061
Acquisition expenses 0 0 98
Depreciation and amortization 168,508 160,710 155,211
Total operating expenses 540,654 516,623 493,457
Total operating income 190,857 192,903 183,896
Other income (expense):      
Interest income 10,661 2,942 647
Interest expense (79,623) (68,473) (70,595)
Loss on early extinguishment of debt 0 (2,157) (552)
Loss from derivative financial instruments 0 (289) 0
Income before income taxes 121,895 124,926 113,396
Income tax expense (4,642) (6,673) (6,146)
Net income 117,253 118,253 107,250
Private perpetual preferred unit distributions (936) (936) (936)
Net income attributable to common unitholders $ 116,317 $ 117,317 $ 106,314
Total weighted average units:      
Basic (in units) 297,258 296,455 276,848
Diluted (in units) 297,259 298,049 277,568
Net income per unit:      
Basic net income per unit (in dollars per unit) $ 0.39 $ 0.39 $ 0.38
Diluted net income per unit (in dollars per unit) $ 0.39 $ 0.39 $ 0.38