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Segment Reporting - Components of Segment Profit for Each Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Revenues: |  |  |  |  |
Total revenues | $ 178,529 | $ 176,349 | $ 345,800 | $ 340,682 |
Operating expenses: |  |  |  |  |
Property operating expenses | 39,418 | 38,529 | 83,603 | 80,739 |
Intercompany rent expense | 0 | 0 | 0 | 0 |
Ground rent expenses | 2,332 | 2,332 | 4,663 | 4,663 |
General and administrative expenses | 13,225 | 12,579 | 25,853 | 23,667 |
Observatory expenses | 7,678 | 7,176 | 15,014 | 14,431 |
Real estate taxes | 26,743 | 24,542 | 53,487 | 49,100 |
Depreciation and amortization | 39,468 | 40,532 | 79,351 | 81,378 |
Total operating expenses | 128,864 | 125,690 | 261,971 | 253,978 |
Total operating income | 49,665 | 50,659 | 83,829 | 86,704 |
Other income (expense): |  |  |  |  |
Interest income | 2,499 | 775 | 3,724 | 1,396 |
Interest expense | (20,525) | (17,477) | (38,116) | (35,219) |
Loss from derivative financial instruments | 0 | (42) | 0 | (289) |
Income before income taxes | 31,639 | 33,915 | 49,437 | 52,592 |
Income tax (expense) benefit | (1,455) | (2,556) | (1,195) | (2,088) |
Net income | 30,184 | 31,359 | 48,242 | 50,504 |
Segment assets | 4,162,905 | 3,831,201 | 4,162,905 | 3,831,201 | $ 3,931,347
Expenditures for segment assets | 76,889 | 61,324 | 123,239 | 109,384 |
Intersegment Elimination |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues | (21,990) | (20,675) | (35,551) | (34,053) |
Operating expenses: |  |  |  |  |
Property operating expenses | 0 | 0 | 0 | 0 |
Intercompany rent expense | (21,990) | (20,675) | (35,551) | (34,053) |
Ground rent expenses | 0 | 0 | 0 | 0 |
General and administrative expenses | 0 | 0 | 0 | 0 |
Observatory expenses | 0 | 0 | 0 | 0 |
Real estate taxes | 0 | 0 | 0 | 0 |
Depreciation and amortization | 0 | 0 | 0 | 0 |
Total operating expenses | (21,990) | (20,675) | (35,551) | (34,053) |
Total operating income | 0 | 0 | 0 | 0 |
Other income (expense): |  |  |  |  |
Interest income | 0 | 0 | 0 | 0 |
Interest expense | 0 | 0 | 0 | 0 |
Loss from derivative financial instruments |  | 0 |  | 0 |
Income before income taxes | 0 | 0 | 0 | 0 |
Income tax (expense) benefit | 0 | 0 | 0 | 0 |
Net income | 0 | 0 | 0 | 0 |
Segment assets | 0 | 0 | 0 | 0 |
Expenditures for segment assets | 0 | 0 | 0 | 0 |
Real Estate | Operating Segments |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues | 165,318 | 163,058 | 324,901 | 319,829 |
Operating expenses: |  |  |  |  |
Property operating expenses | 39,418 | 38,529 | 83,603 | 80,739 |
Intercompany rent expense | 0 | 0 | 0 | 0 |
Ground rent expenses | 2,332 | 2,332 | 4,663 | 4,663 |
General and administrative expenses | 13,225 | 12,579 | 25,853 | 23,667 |
Observatory expenses | 0 | 0 | 0 | 0 |
Real estate taxes | 26,743 | 24,542 | 53,487 | 49,100 |
Depreciation and amortization | 39,452 | 40,458 | 79,317 | 81,291 |
Total operating expenses | 121,170 | 118,440 | 246,923 | 239,460 |
Total operating income | 44,148 | 44,618 | 77,978 | 80,369 |
Other income (expense): |  |  |  |  |
Interest income | 2,499 | 775 | 3,724 | 1,396 |
Interest expense | (20,525) | (17,477) | (38,116) | (35,219) |
Loss from derivative financial instruments |  | (42) |  | (289) |
Income before income taxes | 26,122 | 27,874 | 43,586 | 46,257 |
Income tax (expense) benefit | (268) | (413) | (575) | (696) |
Net income | 25,854 | 27,461 | 43,011 | 45,561 |
Segment assets | 3,902,676 | 3,579,873 | 3,902,676 | 3,579,873 |
Expenditures for segment assets | 61,017 | 54,474 | 95,816 | 102,534 |
Observatory | Operating Segments |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues | 35,201 | 33,966 | 56,450 | 54,906 |
Operating expenses: |  |  |  |  |
Property operating expenses | 0 | 0 | 0 | 0 |
Intercompany rent expense | 21,990 | 20,675 | 35,551 | 34,053 |
Ground rent expenses | 0 | 0 | 0 | 0 |
General and administrative expenses | 0 | 0 | 0 | 0 |
Observatory expenses | 7,678 | 7,176 | 15,014 | 14,431 |
Real estate taxes | 0 | 0 | 0 | 0 |
Depreciation and amortization | 16 | 74 | 34 | 87 |
Total operating expenses | 29,684 | 27,925 | 50,599 | 48,571 |
Total operating income | 5,517 | 6,041 | 5,851 | 6,335 |
Other income (expense): |  |  |  |  |
Interest income | 0 | 0 | 0 | 0 |
Interest expense | 0 | 0 | 0 | 0 |
Loss from derivative financial instruments |  | 0 |  | 0 |
Income before income taxes | 5,517 | 6,041 | 5,851 | 6,335 |
Income tax (expense) benefit | (1,187) | (2,143) | (620) | (1,392) |
Net income | 4,330 | 3,898 | 5,231 | 4,943 |
Segment assets | 260,229 | 251,328 | 260,229 | 251,328 |
Expenditures for segment assets | 15,872 | 6,850 | 27,423 | 6,850 |
Rental revenue |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues | 124,038 | 120,844 | 246,349 | 237,957 |
Rental revenue | Intersegment Elimination |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues | 0 | 0 | 0 | 0 |
Rental revenue | Real Estate | Operating Segments |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues | 124,038 | 120,844 | 246,349 | 237,957 |
Rental revenue | Observatory | Operating Segments |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues | 0 | 0 | 0 | 0 |
Intercompany Rental Revenue |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues | 0 | 0 | 0 | 0 |
Intercompany Rental Revenue | Intersegment Elimination |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues | (21,990) | (20,675) | (35,551) | (34,053) |
Intercompany Rental Revenue | Real Estate | Operating Segments |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues | 21,990 | 20,675 | 35,551 | 34,053 |
Intercompany Rental Revenue | Observatory | Operating Segments |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues | 0 | 0 | 0 | 0 |
Tenant expense reimbursement |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues | 16,205 | 17,569 | 33,999 | 33,543 |
Tenant expense reimbursement | Intersegment Elimination |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues | 0 | 0 | 0 | 0 |
Tenant expense reimbursement | Real Estate | Operating Segments |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues | 16,205 | 17,569 | 33,999 | 33,543 |
Tenant expense reimbursement | Observatory | Operating Segments |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues | 0 | 0 | 0 | 0 |
Observatory revenue |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues | 35,201 | 33,966 | 56,450 | 54,906 |
Observatory revenue | Intersegment Elimination |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues | 0 | 0 | 0 | 0 |
Observatory revenue | Real Estate | Operating Segments |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues | 0 | 0 | 0 | 0 |
Observatory revenue | Observatory | Operating Segments |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues | 35,201 | 33,966 | 56,450 | 54,906 |
Lease termination fees |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues | 357 | 1,251 | 979 | 9,189 |
Lease termination fees | Intersegment Elimination |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues | 0 | 0 | 0 | 0 |
Lease termination fees | Real Estate | Operating Segments |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues | 357 | 1,251 | 979 | 9,189 |
Lease termination fees | Observatory | Operating Segments |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues | 0 | 0 | 0 | 0 |
Third-party management and other fees |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues | 376 | 392 | 839 | 743 |
Third-party management and other fees | Intersegment Elimination |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues | 0 | 0 | 0 | 0 |
Third-party management and other fees | Real Estate | Operating Segments |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues | 376 | 392 | 839 | 743 |
Third-party management and other fees | Observatory | Operating Segments |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues | 0 | 0 | 0 | 0 |
Other revenue and fees |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues | 2,352 | 2,327 | 7,184 | 4,344 |
Other revenue and fees | Intersegment Elimination |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues | 0 | 0 | 0 | 0 |
Other revenue and fees | Real Estate | Operating Segments |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues | 2,352 | 2,327 | 7,184 | 4,344 |
Other revenue and fees | Observatory | Operating Segments |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues | $ 0 | $ 0 | $ 0 | $ 0 |

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