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Condensed Consolidated Statements of Income (unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Revenues:        
Rental revenue $ 123,621 $ 122,391 $ 369,970 $ 360,348
Tenant expense reimbursement 18,627 20,346 52,626 53,889
Observatory revenue 40,241 39,306 96,691 94,212
Lease termination fees 1,185 1,165 2,164 10,354
Third-party management and other fees 312 345 1,151 1,088
Other revenue and fees 2,416 2,993 9,600 7,338
Revenues $ 186,402 $ 186,546 $ 532,202 $ 527,229
Earnings per unit attributable to common unitholders:        
Basic (in USD per unit) $ 0.10 $ 0.12 $ 0.26 $ 0.29
Diluted (in USD per unit) $ 0.10 $ 0.12 $ 0.26 $ 0.28
Total weighted average units:        
Basic (in units) 297,478 296,389 297,180 296,389
Diluted (in units) 297,478 297,871 297,181 298,089
Other income (expense):        
Interest income $ 3,485 $ 774 $ 7,209 $ 2,169
Interest expense (20,658) (16,890) (58,774) (52,109)
Loss on early extinguishment of debt 0 (2,157) 0 (2,157)
Loss from derivative financial instruments 0 0 0 (289)
Income before income taxes 31,365 37,734 80,802 90,326
Income tax expense (2,135) (2,245) (3,330) (4,333)
Net income 29,230 35,489 77,472 85,993
Private perpetual preferred unit distributions (234) (234) (702) (702)
Net income attributable to common unitholders 28,996 35,255 76,770 85,291
Operating expenses:        
Property operating expenses 42,772 41,270 126,375 122,009
Ground rent expenses 2,331 2,331 6,994 6,994
General and administrative expenses 13,148 12,899 39,001 36,566
Observatory expenses 8,854 8,648 23,868 23,079
Real estate taxes 28,284 26,901 81,771 76,001
Depreciation and amortization 42,475 38,490 121,826 119,868
Total operating expenses 137,864 130,539 399,835 384,517
Total operating income $ 48,538 $ 56,007 $ 132,367 $ 142,712
Dividends per unit (in USD per unit) $ 0.105 $ 0.105 $ 0.315 $ 0.315