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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, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | 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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Reconciliation of Revenue and Profit or Loss from Segments to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental revenue |  |  |  |  |  |  |  |  |  |  |  |  | $ 483,944 | $ 460,653 | $ 447,784
Intercompany rental revenue |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Tenant expense reimbursement |  |  |  |  |  |  |  |  |  |  |  |  | 73,679 | 73,459 | 79,516
Observatory revenue |  |  |  |  |  |  |  |  |  |  |  |  | 127,118 | 124,814 | 112,172
Construction revenue |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 1,981
Third-party management and other fees |  |  |  |  |  |  |  |  |  |  |  |  | 1,400 | 1,766 | 2,133
Other revenue and fees |  |  |  |  |  |  |  |  |  |  |  |  | 26,327 | 17,308 | 14,048
Total revenues | $ 183,070 | $ 187,320 | $ 177,124 | $ 164,954 | $ 179,263 | $ 175,848 | $ 165,815 | $ 157,074 | $ 165,200 | $ 175,779 | $ 164,773 | $ 151,882 | 712,468 | 678,000 | 657,634
Operating expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property operating expenses |  |  |  |  |  |  |  |  |  |  |  |  | 163,531 | 153,850 | 158,638
Intercompany rent expense |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Ground rent expense |  |  |  |  |  |  |  |  |  |  |  |  | 9,326 | 9,326 | 9,326
General and administrative expenses |  |  |  |  |  |  |  |  |  |  |  |  | 50,315 | 49,078 | 38,073
Observatory expenses |  |  |  |  |  |  |  |  |  |  |  |  | 30,275 | 29,833 | 32,174
Construction expenses |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 3,222
Real estate taxes |  |  |  |  |  |  |  |  |  |  |  |  | 102,466 | 96,061 | 93,165
Acquisition expenses |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 98 | 193
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  | 160,710 | 155,211 | 171,474
Total operating expenses |  |  |  |  |  |  |  |  |  |  |  |  | 516,623 | 493,457 | 506,265
Total operating income | 50,964 | 56,781 | 51,434 | 36,666 | 52,651 | 53,586 | 44,192 | 34,114 | 37,230 | 45,343 | 45,039 | 23,757 | 195,845 | 184,543 | 151,369
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  | (68,473) | (70,595) | (65,743)
Loss on early extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  | (2,157) | (552) | (1,749)
Loss from derivative financial instruments |  |  |  |  |  |  |  |  |  |  |  |  | (289) | 0 | 0
Income before income taxes |  |  |  |  |  |  |  |  |  |  |  |  | 124,926 | 113,396 | 83,877
Income tax expense |  |  |  |  |  |  |  |  |  |  |  |  | (6,673) | (6,146) | (3,949)
Net income | 32,260 | $ 35,489 | $ 31,359 | $ 19,145 | 33,008 | $ 32,897 | $ 24,640 | $ 16,705 | 19,370 | $ 26,085 | $ 26,585 | $ 7,888 | 118,253 | 107,250 | 79,928
Segment assets | 3,931,347 |  |  |  | 3,890,953 |  |  |  | 3,300,650 |  |  |  | 3,931,347 | 3,890,953 | 3,300,650
Expenditures for segment assets |  |  |  |  |  |  |  |  |  |  |  |  | 228,162 | 197,680 | 156,754
Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reconciliation of Revenue and Profit or Loss from Segments to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental revenue |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Intercompany rental revenue |  |  |  |  |  |  |  |  |  |  |  |  | (77,646) | (75,658) | (68,255)
Tenant expense reimbursement |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Observatory revenue |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Construction revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,715)
Third-party management and other fees |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other revenue and fees |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  | (77,646) | (75,658) | (71,970)
Operating expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property operating expenses |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Intercompany rent expense |  |  |  |  |  |  |  |  |  |  |  |  | (77,646) | (75,658) | (68,255)
Ground rent expense |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
General and administrative expenses |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Observatory expenses |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Construction expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,317)
Real estate taxes |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Acquisition expenses |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total operating expenses |  |  |  |  |  |  |  |  |  |  |  |  | (77,646) | (75,658) | (71,572)
Total operating income |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | (398)
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Loss on early extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |
Loss from derivative financial instruments |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |
Income before income taxes |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | (398)
Income tax expense |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | (398)
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 |  |  |  |  |  |  |  |  |  |  |  |  | 483,944 | 460,653 | 447,784
Intercompany rental revenue |  |  |  |  |  |  |  |  |  |  |  |  | 77,646 | 75,658 | 68,255
Tenant expense reimbursement |  |  |  |  |  |  |  |  |  |  |  |  | 73,679 | 73,459 | 79,516
Observatory revenue |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Construction revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0
Third-party management and other fees |  |  |  |  |  |  |  |  |  |  |  |  | 1,400 | 1,766 | 2,133
Other revenue and fees |  |  |  |  |  |  |  |  |  |  |  |  | 26,327 | 17,293 | 14,048
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  | 662,996 | 628,829 | 611,736
Operating expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property operating expenses |  |  |  |  |  |  |  |  |  |  |  |  | 163,531 | 153,850 | 158,638
Intercompany rent expense |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Ground rent expense |  |  |  |  |  |  |  |  |  |  |  |  | 9,326 | 9,326 | 9,326
General and administrative expenses |  |  |  |  |  |  |  |  |  |  |  |  | 50,315 | 49,078 | 38,073
Observatory expenses |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Construction expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0
Real estate taxes |  |  |  |  |  |  |  |  |  |  |  |  | 102,466 | 96,061 | 93,165
Acquisition expenses |  |  |  |  |  |  |  |  |  |  |  |  |  | 98 | 193
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  | 160,630 | 154,817 | 171,035
Total operating expenses |  |  |  |  |  |  |  |  |  |  |  |  | 486,268 | 463,230 | 470,430
Total operating income |  |  |  |  |  |  |  |  |  |  |  |  | 176,728 | 165,599 | 141,306
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  | (68,473) | (70,595) | (65,743)
Loss on early extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  | (2,157) | (552) | (1,749)
Loss from derivative financial instruments |  |  |  |  |  |  |  |  |  |  |  |  | (289) |  |
Income before income taxes |  |  |  |  |  |  |  |  |  |  |  |  | 105,809 | 94,452 | 73,814
Income tax expense |  |  |  |  |  |  |  |  |  |  |  |  | (1,306) | (1,361) | (1,498)
Net income |  |  |  |  |  |  |  |  |  |  |  |  | 104,503 | 93,091 | 72,316
Segment assets | 3,670,907 |  |  |  | 3,641,844 |  |  |  | 3,058,250 |  |  |  | 3,670,907 | 3,641,844 | 3,058,250
Expenditures for segment assets |  |  |  |  |  |  |  |  |  |  |  |  | 191,541 | 197,680 | 156,543
Observatory, Segment [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 |  |  |  |  |  |  |  |  |  |  |  |  | 127,118 | 124,814 | 112,172
Construction revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0
Third-party management and other fees |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other revenue and fees |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 15 | 0
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  | 127,118 | 124,829 | 112,172
Operating expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property operating expenses |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Intercompany rent expense |  |  |  |  |  |  |  |  |  |  |  |  | 77,646 | 75,658 | 68,255
Ground rent expense |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
General and administrative expenses |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Observatory expenses |  |  |  |  |  |  |  |  |  |  |  |  | 30,275 | 29,833 | 32,174
Construction expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0
Real estate taxes |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Acquisition expenses |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  | 80 | 394 | 338
Total operating expenses |  |  |  |  |  |  |  |  |  |  |  |  | 108,001 | 105,885 | 100,767
Total operating income |  |  |  |  |  |  |  |  |  |  |  |  | 19,117 | 18,944 | 11,405
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Loss on early extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |
Loss from derivative financial instruments |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |
Income before income taxes |  |  |  |  |  |  |  |  |  |  |  |  | 19,117 | 18,944 | 11,405
Income tax expense |  |  |  |  |  |  |  |  |  |  |  |  | (5,367) | (4,785) | (2,791)
Net income |  |  |  |  |  |  |  |  |  |  |  |  | 13,750 | 14,159 | 8,614
Segment assets | $ 260,440 |  |  |  | $ 249,109 |  |  |  | 241,511 |  |  |  | 260,440 | 249,109 | 241,511
Expenditures for segment assets |  |  |  |  |  |  |  |  |  |  |  |  | $ 36,621 | $ 0 | 211
Other [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reconciliation of Revenue and Profit or Loss from Segments to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0
Intercompany rental revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0
Tenant expense reimbursement |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0
Observatory revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0
Construction revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,696
Third-party management and other fees |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0
Other revenue and fees |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,696
Operating expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property operating expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0
Intercompany rent expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0
Ground rent expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0
General and administrative expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0
Observatory expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0
Construction expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,539
Real estate taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0
Acquisition expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 101
Total operating expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,640
Total operating income |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (944)
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0
Income before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (944)
Income tax expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 340
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (604)
Segment assets |  |  |  |  |  |  |  |  | $ 889 |  |  |  |  |  | 889
Expenditures for segment assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0

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- Definition [Line Items] for Reconciliation of Revenue and Profit or Loss from Segments to Consolidated [Table] + References No definition available. + Details
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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(12)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(11)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e1043-128460 + Details
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- Definition The aggregate revenue from building and real estate development, which may include improvements (such as drainage, utilities, grading and subdividing) to a parcel of land, and general contracting services during the reporting period. + 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 The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959 + Details
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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=77902458&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 The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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