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Segment Reporting - Components of Segment Profit for Each Segment (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Revenues: |  |  |
Rental revenue | $ 122,311 | $ 117,113 |
Intercompany rental revenue | 0 | 0 |
Tenant expense reimbursement | 17,794 | 15,974 |
Observatory revenue | 21,249 | 20,940 |
Lease termination fees | 622 | 7,938 |
Third-party management and other fees | 463 | 351 |
Other revenue and fees | 6,057 | 2,638 |
Total revenues | 168,496 | 164,954 |
Operating expenses: |  |  |
Property operating expenses | 44,185 | 42,210 |
Intercompany rent expense | 0 | 0 |
Ground rent expenses | 2,331 | 2,331 |
General and administrative expenses | 12,628 | 11,088 |
Observatory expenses | 7,336 | 7,255 |
Real estate taxes | 26,744 | 24,558 |
Depreciation and amortization | 39,883 | 40,846 |
Total operating expenses | 133,107 | 128,288 |
Total operating income | 35,389 | 36,666 |
Other expenses: |  |  |
Interest expense | (17,591) | (17,742) |
Loss from derivative financial instruments | 0 | (247) |
Income before income taxes | 17,798 | 18,677 |
Income tax (expense) benefit | 260 | 468 |
Net income | 18,058 | 19,145 |
Segment assets | 4,141,813 | 3,866,176 | $ 3,931,347
Expenditures for segment assets | 46,350 | 48,060 |
Intersegment Elimination |  |  |
Revenues: |  |  |
Rental revenue | 0 | 0 |
Intercompany rental revenue | (13,561) | (13,378) |
Tenant expense reimbursement | 0 | 0 |
Observatory revenue | 0 | 0 |
Lease termination fees | 0 | 0 |
Third-party management and other fees | 0 | 0 |
Other revenue and fees | 0 | 0 |
Total revenues | (13,561) | (13,378) |
Operating expenses: |  |  |
Property operating expenses | 0 | 0 |
Intercompany rent expense | (13,561) | (13,378) |
Ground rent expenses | 0 | 0 |
General and administrative expenses | 0 | 0 |
Observatory expenses | 0 | 0 |
Real estate taxes | 0 | 0 |
Depreciation and amortization | 0 | 0 |
Total operating expenses | (13,561) | (13,378) |
Total operating income | 0 | 0 |
Other expenses: |  |  |
Interest expense | 0 | 0 |
Loss from derivative financial instruments |  | 0 |
Income before income taxes | 0 | 0 |
Income tax (expense) benefit | 0 | 0 |
Net income | 0 | 0 |
Segment assets | 0 | 0 |
Expenditures for segment assets | 0 | 0 |
Real Estate | Operating Segments |  |  |
Revenues: |  |  |
Rental revenue | 122,311 | 117,113 |
Intercompany rental revenue | 13,561 | 13,378 |
Tenant expense reimbursement | 17,794 | 15,974 |
Observatory revenue | 0 | 0 |
Lease termination fees | 622 | 7,938 |
Third-party management and other fees | 463 | 351 |
Other revenue and fees | 6,057 | 2,638 |
Total revenues | 160,808 | 157,392 |
Operating expenses: |  |  |
Property operating expenses | 44,185 | 42,210 |
Intercompany rent expense | 0 | 0 |
Ground rent expenses | 2,331 | 2,331 |
General and administrative expenses | 12,628 | 11,088 |
Observatory expenses | 0 | 0 |
Real estate taxes | 26,744 | 24,558 |
Depreciation and amortization | 39,865 | 40,833 |
Total operating expenses | 125,753 | 121,020 |
Total operating income | 35,055 | 36,372 |
Other expenses: |  |  |
Interest expense | (17,591) | (17,742) |
Loss from derivative financial instruments |  | (247) |
Income before income taxes | 17,464 | 18,383 |
Income tax (expense) benefit | (307) | (283) |
Net income | 17,157 | 18,100 |
Segment assets | 3,887,337 | 3,617,276 |
Expenditures for segment assets | 34,797 | 48,054 |
Observatory | Operating Segments |  |  |
Revenues: |  |  |
Rental revenue | 0 | 0 |
Intercompany rental revenue | 0 | 0 |
Tenant expense reimbursement | 0 | 0 |
Observatory revenue | 21,249 | 20,940 |
Lease termination fees | 0 | 0 |
Third-party management and other fees | 0 | 0 |
Other revenue and fees | 0 | 0 |
Total revenues | 21,249 | 20,940 |
Operating expenses: |  |  |
Property operating expenses | 0 | 0 |
Intercompany rent expense | 13,561 | 13,378 |
Ground rent expenses | 0 | 0 |
General and administrative expenses | 0 | 0 |
Observatory expenses | 7,336 | 7,255 |
Real estate taxes | 0 | 0 |
Depreciation and amortization | 18 | 13 |
Total operating expenses | 20,915 | 20,646 |
Total operating income | 334 | 294 |
Other expenses: |  |  |
Interest expense | 0 | 0 |
Loss from derivative financial instruments |  | 0 |
Income before income taxes | 334 | 294 |
Income tax (expense) benefit | 567 | 751 |
Net income | 901 | 1,045 |
Segment assets | 254,476 | 248,900 |
Expenditures for segment assets | $ 11,553 | $ 6 |

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