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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Revenues:      
Rental revenue $ 460,653 $ 447,784 $ 400,825
Tenant expense reimbursement 73,459 79,516 67,651
Observatory revenue 124,814 112,172 111,541
Construction revenue 0 1,981 38,648
Third-party management and other fees 1,766 2,133 2,376
Other revenue and fees 17,308 14,048 14,285
Total revenues 678,000 657,634 635,326
Operating expenses:      
Property operating expenses 153,850 158,638 148,676
Ground rent expense 9,326 9,326 5,339
General and administrative expenses 49,078 38,073 39,037
Observatory expenses 29,833 32,174 31,413
Construction expenses 0 3,222 38,596
Real estate taxes 96,061 93,165 82,131
Acquisition expenses 98 193 3,382
Depreciation and amortization 155,211 171,474 145,431
Total operating expenses 493,457 506,265 494,005
Total operating income 184,543 151,369 141,321
Interest expense (71,147) (67,492) (66,456)
Income before income taxes 113,396 83,877 74,865
Income tax expense (6,146) (3,949) (4,655)
Net income 107,250 79,928 70,210
Private perpetual preferred unit distributions (936) (936) (476)
Net income attributable to common unitholders $ 106,314 $ 78,992 $ 69,734
Total weighted average units:      
Basic (in units) 276,848 265,914 254,506
Diluted (in units) 277,568 265,914 254,506
Net income per unit:      
Basic net income per unit (in dollars per unit) $ 0.38 $ 0.29 $ 0.27
Diluted net income per unit (in dollars per unit) $ 0.38 $ 0.29 $ 0.27