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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, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Reconciliation of Revenue and Profit or Loss from Segments to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental revenue |  |  |  |  |  |  |  |  |  |  |  |  | $ 460,653 | $ 447,784 | $ 400,825
Intercompany rental revenue |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
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 | $ 179,263 | $ 175,848 | $ 165,815 | $ 157,074 | $ 165,200 | $ 175,779 | $ 164,773 | $ 151,882 | $ 170,411 | $ 169,441 | $ 155,168 | $ 140,306 | 678,000 | 657,634 | 635,326
Property operating expenses |  |  |  |  |  |  |  |  |  |  |  |  | 153,850 | 158,638 | 148,676
Intercompany rent expense |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
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 | 52,651 | 53,586 | 44,192 | 34,114 | 37,230 | 45,343 | 45,039 | 23,757 | 31,282 | 43,412 | 42,539 | 24,088 | 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) benefit |  |  |  |  |  |  |  |  |  |  |  |  | (6,146) | (3,949) | (4,655)
Net income | 33,008 | $ 32,897 | $ 24,640 | $ 16,705 | 19,370 | $ 26,085 | $ 26,585 | $ 7,888 | 10,964 | $ 22,734 | $ 25,281 | $ 11,231 | 107,250 | 79,928 | 70,210
Segment assets | 3,890,953 |  |  |  | 3,300,650 |  |  |  | 3,283,497 |  |  |  | 3,890,953 | 3,300,650 | 3,283,497
Expenditures for segment assets |  |  |  |  |  |  |  |  |  |  |  |  | 197,680 | 156,754 | 497,744
Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reconciliation of Revenue and Profit or Loss from Segments to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental revenue |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Intercompany rental revenue |  |  |  |  |  |  |  |  |  |  |  |  | (75,658) | (68,255) | (69,293)
Tenant expense reimbursement |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Observatory revenue |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Construction revenue |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,715) | (6,341)
Third-party management and other fees |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other revenue and fees |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  | (75,658) | (71,970) | (75,634)
Property operating expenses |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Intercompany rent expense |  |  |  |  |  |  |  |  |  |  |  |  | (75,658) | (68,255) | (69,293)
Ground rent expense |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
General and administrative expenses |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Observatory expenses |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Construction expenses |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,317) | (5,589)
Real estate taxes |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Acquisition expenses |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total operating expenses |  |  |  |  |  |  |  |  |  |  |  |  | (75,658) | (71,572) | (74,882)
Total operating income |  |  |  |  |  |  |  |  |  |  |  |  | 0 | (398) | (752)
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income before income taxes |  |  |  |  |  |  |  |  |  |  |  |  | 0 | (398) | (752)
Income tax (expense) benefit |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income |  |  |  |  |  |  |  |  |  |  |  |  | 0 | (398) | (752)
Segment assets | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 0
Expenditures for segment assets |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Real Estate [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reconciliation of Revenue and Profit or Loss from Segments to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental revenue |  |  |  |  |  |  |  |  |  |  |  |  | 460,653 | 447,784 | 400,825
Intercompany rental revenue |  |  |  |  |  |  |  |  |  |  |  |  | 75,658 | 68,255 | 69,293
Tenant expense reimbursement |  |  |  |  |  |  |  |  |  |  |  |  | 73,459 | 79,516 | 67,651
Observatory revenue |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Construction revenue |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Third-party management and other fees |  |  |  |  |  |  |  |  |  |  |  |  | 1,766 | 2,133 | 2,376
Other revenue and fees |  |  |  |  |  |  |  |  |  |  |  |  | 17,293 | 14,048 | 13,280
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  | 628,829 | 611,736 | 553,425
Property operating expenses |  |  |  |  |  |  |  |  |  |  |  |  | 153,850 | 158,638 | 148,676
Intercompany rent expense |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Ground rent expense |  |  |  |  |  |  |  |  |  |  |  |  | 9,326 | 9,326 | 5,339
General and administrative expenses |  |  |  |  |  |  |  |  |  |  |  |  | 49,078 | 38,073 | 39,037
Observatory expenses |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Construction expenses |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Real estate taxes |  |  |  |  |  |  |  |  |  |  |  |  | 96,061 | 93,165 | 82,131
Acquisition expenses |  |  |  |  |  |  |  |  |  |  |  |  | 98 | 193 | 3,382
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  | 154,817 | 171,035 | 145,121
Total operating expenses |  |  |  |  |  |  |  |  |  |  |  |  | 463,230 | 470,430 | 423,686
Total operating income |  |  |  |  |  |  |  |  |  |  |  |  | 165,599 | 141,306 | 129,739
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  | (71,147) | (67,492) | (66,456)
Income before income taxes |  |  |  |  |  |  |  |  |  |  |  |  | 94,452 | 73,814 | 63,283
Income tax (expense) benefit |  |  |  |  |  |  |  |  |  |  |  |  | (1,361) | (1,498) | (1,437)
Net income |  |  |  |  |  |  |  |  |  |  |  |  | 93,091 | 72,316 | 61,846
Segment assets | 3,641,844 |  |  |  | 3,058,250 |  |  |  | 3,023,089 |  |  |  | 3,641,844 | 3,058,250 | 3,023,089
Expenditures for segment assets |  |  |  |  |  |  |  |  |  |  |  |  | 197,680 | 156,543 | 497,645
Observatory [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reconciliation of Revenue and Profit or Loss from Segments to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental revenue |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Intercompany rental revenue |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Tenant expense reimbursement |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Observatory revenue |  |  |  |  |  |  |  |  |  |  |  |  | 124,814 | 112,172 | 111,541
Construction revenue |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Third-party management and other fees |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other revenue and fees |  |  |  |  |  |  |  |  |  |  |  |  | 15 | 0 | 982
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  | 124,829 | 112,172 | 112,523
Property operating expenses |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Intercompany rent expense |  |  |  |  |  |  |  |  |  |  |  |  | 75,658 | 68,255 | 69,293
Ground rent expense |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
General and administrative expenses |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Observatory expenses |  |  |  |  |  |  |  |  |  |  |  |  | 29,833 | 32,174 | 31,413
Construction expenses |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Real estate taxes |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Acquisition expenses |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  | 394 | 338 | 295
Total operating expenses |  |  |  |  |  |  |  |  |  |  |  |  | 105,885 | 100,767 | 101,001
Total operating income |  |  |  |  |  |  |  |  |  |  |  |  | 18,944 | 11,405 | 11,522
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income before income taxes |  |  |  |  |  |  |  |  |  |  |  |  | 18,944 | 11,405 | 11,522
Income tax (expense) benefit |  |  |  |  |  |  |  |  |  |  |  |  | (4,785) | (2,791) | (2,876)
Net income |  |  |  |  |  |  |  |  |  |  |  |  | 14,159 | 8,614 | 8,646
Segment assets | $ 249,109 |  |  |  | 241,511 |  |  |  | 252,376 |  |  |  | 249,109 | 241,511 | 252,376
Expenditures for segment assets |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | 211 | 99
Other [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reconciliation of Revenue and Profit or Loss from Segments to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental revenue |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Intercompany rental revenue |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Tenant expense reimbursement |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Observatory revenue |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Construction revenue |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,696 | 44,989
Third-party management and other fees |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Other revenue and fees |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 23
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,696 | 45,012
Property operating expenses |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Intercompany rent expense |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Ground rent expense |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
General and administrative expenses |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Observatory expenses |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Construction expenses |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,539 | 44,185
Real estate taxes |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Acquisition expenses |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  | 101 | 15
Total operating expenses |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,640 | 44,200
Total operating income |  |  |  |  |  |  |  |  |  |  |  |  |  | (944) | 812
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Income before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  | (944) | 812
Income tax (expense) benefit |  |  |  |  |  |  |  |  |  |  |  |  |  | 340 | (342)
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  | (604) | 470
Segment assets |  |  |  |  | $ 889 |  |  |  | $ 8,032 |  |  |  |  | 889 | 8,032
Expenditures for segment assets |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0

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- Definition The total amount of revenue recognized for the period from operating leases, including minimum lease revenue, contingent revenue, percentage revenue and sublease revenue. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7501430&loc=d3e39896-112707 + Details
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- Definition Other real estate revenue not otherwise specified in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition A tax based on the assessed value of real estate by the local government. The tax is usually based on the value of property (including the land). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6419918&loc=d3e35301-107843 + Details
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