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Segment Reporting - Segment Revenue and Profit or Loss Reconciliation (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Reconciliation of Revenue and Profit or Loss from Segments to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental revenue |  |  |  |  |  |  |  |  |  |  |  |  | $ 586,414 |  |
Rental revenue |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 493,231 | $ 483,944
Intercompany rental revenue |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Tenant expense reimbursement |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 72,372 | 73,679
Observatory revenue |  |  |  |  |  |  |  |  |  |  |  |  | 128,769 | 131,227 | 127,118
Lease termination fees |  |  |  |  |  |  |  |  |  |  |  |  | 4,352 | 20,847 | 13,551
Third-party management and other fees |  |  |  |  |  |  |  |  |  |  |  |  | 1,254 | 1,440 | 1,400
Other revenue and fees |  |  |  |  |  |  |  |  |  |  |  |  | 10,554 | 12,394 | 9,834
Total revenues | $ 194,933 | $ 192,873 | $ 176,244 | $ 167,293 | $ 199,309 | $ 186,402 | $ 178,529 | $ 167,271 | $ 182,297 | $ 186,547 | $ 176,349 | $ 164,333 | 731,343 | 731,511 | 709,526
Operating expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property operating expenses |  |  |  |  |  |  |  |  |  |  |  |  | 174,977 | 167,379 | 163,531
Intercompany rent expense |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Ground rent expense |  |  |  |  |  |  |  |  |  |  |  |  | 9,326 | 9,326 | 9,326
General and administrative expenses |  |  |  |  |  |  |  |  |  |  |  |  | 61,063 | 52,674 | 50,315
Observatory expenses |  |  |  |  |  |  |  |  |  |  |  |  | 33,767 | 32,767 | 30,275
Real estate taxes |  |  |  |  |  |  |  |  |  |  |  |  | 115,916 | 110,000 | 102,466
Acquisition expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  | 181,588 | 168,508 | 160,710
Total operating expenses |  |  |  |  |  |  |  |  |  |  |  |  | 576,637 | 540,654 | 516,623
Total operating income | 47,112 | 45,279 | 36,239 | 26,076 | 58,490 | 48,538 | 49,665 | 34,164 | 50,191 | 56,008 | 50,659 | 36,045 | 154,706 | 190,857 | 192,903
Other income (expense): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  |  |  |  | 11,259 | 10,661 | 2,942
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  | (79,246) | (79,623) | (68,473)
Loss on early extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | (2,157)
Loss from derivative financial instruments |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | (289)
Income before income taxes |  |  |  |  |  |  |  |  |  |  |  |  | 86,719 | 121,895 | 124,926
Income tax expense |  |  |  |  |  |  |  |  |  |  |  |  | (2,429) | (4,642) | (6,673)
Net income | 28,720 | $ 26,784 | $ 18,930 | $ 9,856 | 39,781 | $ 29,230 | $ 30,184 | $ 18,058 | 32,260 | $ 35,489 | $ 31,359 | $ 19,145 | 84,290 | 117,253 | 118,253
Segment assets | 3,931,834 |  |  |  | 4,195,780 |  |  |  | 3,931,347 |  |  |  | 3,931,834 | 4,195,780 | 3,931,347
Expenditures for segment assets |  |  |  |  |  |  |  |  |  |  |  |  | 255,924 | 256,496 | 228,162
Intersegment Elimination |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reconciliation of Revenue and Profit or Loss from Segments to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental revenue |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |
Rental revenue |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Intercompany rental revenue |  |  |  |  |  |  |  |  |  |  |  |  | (82,469) | (79,954) | (77,646)
Tenant expense reimbursement |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Observatory revenue |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Lease termination fees |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Third-party management and other fees |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other revenue and fees |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  | (82,469) | (79,954) | (77,646)
Operating expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property operating expenses |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Intercompany rent expense |  |  |  |  |  |  |  |  |  |  |  |  | (82,469) | (79,954) | (77,646)
Ground rent expense |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
General and administrative expenses |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Observatory expenses |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Real estate taxes |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Acquisition expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total operating expenses |  |  |  |  |  |  |  |  |  |  |  |  | (82,469) | (79,954) | (77,646)
Total operating income |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other income (expense): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Loss on early extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Loss from derivative financial instruments |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Income before income taxes |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income tax expense |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Segment assets | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 0
Expenditures for segment assets |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Real Estate | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reconciliation of Revenue and Profit or Loss from Segments to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental revenue |  |  |  |  |  |  |  |  |  |  |  |  | 586,414 |  |
Rental revenue |  |  |  |  |  |  |  |  |  |  |  |  |  | 493,231 | 483,944
Intercompany rental revenue |  |  |  |  |  |  |  |  |  |  |  |  | 82,469 | 79,954 | 77,646
Tenant expense reimbursement |  |  |  |  |  |  |  |  |  |  |  |  |  | 72,372 | 73,679
Observatory revenue |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Lease termination fees |  |  |  |  |  |  |  |  |  |  |  |  | 4,352 | 20,847 | 13,551
Third-party management and other fees |  |  |  |  |  |  |  |  |  |  |  |  | 1,254 | 1,440 | 1,400
Other revenue and fees |  |  |  |  |  |  |  |  |  |  |  |  | 10,554 | 12,394 | 9,834
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  | 685,043 | 680,238 | 660,054
Operating expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property operating expenses |  |  |  |  |  |  |  |  |  |  |  |  | 174,977 | 167,379 | 163,531
Intercompany rent expense |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Ground rent expense |  |  |  |  |  |  |  |  |  |  |  |  | 9,326 | 9,326 | 9,326
General and administrative expenses |  |  |  |  |  |  |  |  |  |  |  |  | 61,063 | 52,674 | 50,315
Observatory expenses |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Real estate taxes |  |  |  |  |  |  |  |  |  |  |  |  | 115,916 | 110,000 | 102,466
Acquisition expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  | 181,558 | 168,430 | 160,630
Total operating expenses |  |  |  |  |  |  |  |  |  |  |  |  | 542,840 | 507,809 | 486,268
Total operating income |  |  |  |  |  |  |  |  |  |  |  |  | 142,203 | 172,429 | 173,786
Other income (expense): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  |  |  |  | 11,259 | 10,661 | 2,942
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  | (79,246) | (79,623) | (68,473)
Loss on early extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | (2,157)
Loss from derivative financial instruments |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | (289)
Income before income taxes |  |  |  |  |  |  |  |  |  |  |  |  | 74,216 | 103,467 | 105,809
Income tax expense |  |  |  |  |  |  |  |  |  |  |  |  | (896) | (1,114) | (1,306)
Net income |  |  |  |  |  |  |  |  |  |  |  |  | 73,320 | 102,353 | 104,503
Segment assets | 3,671,211 |  |  |  | 3,930,330 |  |  |  | 3,670,907 |  |  |  | 3,671,211 | 3,930,330 | 3,670,907
Expenditures for segment assets |  |  |  |  |  |  |  |  |  |  |  |  | 191,630 | 201,685 | 191,541
Observatory | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reconciliation of Revenue and Profit or Loss from Segments to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental revenue |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |
Rental revenue |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Intercompany rental revenue |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Tenant expense reimbursement |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Observatory revenue |  |  |  |  |  |  |  |  |  |  |  |  | 128,769 | 131,227 | 127,118
Lease termination fees |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Third-party management and other fees |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other revenue and fees |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  | 128,769 | 131,227 | 127,118
Operating expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property operating expenses |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Intercompany rent expense |  |  |  |  |  |  |  |  |  |  |  |  | 82,469 | 79,954 | 77,646
Ground rent expense |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
General and administrative expenses |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Observatory expenses |  |  |  |  |  |  |  |  |  |  |  |  | 33,767 | 32,767 | 30,275
Real estate taxes |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Acquisition expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  | 30 | 78 | 80
Total operating expenses |  |  |  |  |  |  |  |  |  |  |  |  | 116,266 | 112,799 | 108,001
Total operating income |  |  |  |  |  |  |  |  |  |  |  |  | 12,503 | 18,428 | 19,117
Other income (expense): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Loss on early extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Loss from derivative financial instruments |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Income before income taxes |  |  |  |  |  |  |  |  |  |  |  |  | 12,503 | 18,428 | 19,117
Income tax expense |  |  |  |  |  |  |  |  |  |  |  |  | (1,533) | (3,528) | (5,367)
Net income |  |  |  |  |  |  |  |  |  |  |  |  | 10,970 | 14,900 | 13,750
Segment assets | $ 260,623 |  |  |  | $ 265,450 |  |  |  | $ 260,440 |  |  |  | 260,623 | 265,450 | 260,440
Expenditures for segment assets |  |  |  |  |  |  |  |  |  |  |  |  | $ 64,294 | $ 54,811 | $ 36,621

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