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Segment Reporting - Segment Revenue and Profit or Loss Reconciliation (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Reconciliation of Revenue and Profit or Loss from Segments to Consolidated [Line Items] |  |  |  |  |
Rental revenue | $ 115,634 | $ 110,903 | $ 343,155 | $ 333,827 |
Intercompany rental revenue | 0 | 0 | 0 | 0 |
Tenant expense reimbursement | 19,176 | 23,096 | 56,350 | 59,878 |
Observatory revenue | 38,093 | 35,702 | 91,112 | 84,525 |
Construction revenue | 0 | 0 | 0 | 1,981 |
Third-party management and other fees | 404 | 618 | 1,372 | 1,658 |
Other revenue and fees | 2,541 | 5,460 | 6,748 | 10,565 |
Total revenues | 175,848 | 175,779 | 498,737 | 492,434 |
Property operating expenses | 38,585 | 41,052 | 115,075 | 120,341 |
Intercompany rent expense | 0 | 0 | 0 | 0 |
Ground rent expenses | 2,331 | 2,331 | 6,994 | 6,994 |
General and administrative expenses | 11,798 | 10,182 | 35,623 | 28,395 |
Observatory expenses | 7,250 | 7,896 | 21,900 | 23,391 |
Construction expenses | 0 | 0 | 0 | 3,222 |
Real estate taxes | 24,691 | 23,613 | 71,773 | 69,543 |
Acquisition expenses | 0 | 193 | 98 | 193 |
Depreciation and amortization | 37,607 | 45,169 | 115,382 | 126,216 |
Total operating expenses | 122,262 | 130,436 | 366,845 | 378,295 |
Total operating income (loss) | 53,586 | 45,343 | 131,892 | 114,139 |
Interest expense | (17,939) | (16,680) | (53,310) | (50,298) |
Income (loss) before income taxes | 35,647 | 28,663 | 78,582 | 63,841 |
Income tax benefit (expense) | (2,750) | (2,578) | (4,340) | (3,283) |
Net income (loss) | 32,897 | 26,085 | 74,242 | 60,558 |
Segment assets | 3,882,569 | 3,308,767 | 3,882,569 | 3,308,767 | $ 3,300,650
Expenditures for segment assets | 52,828 | 40,102 | 140,099 | 109,315 |
Intersegment Elimination |  |  |  |  |
Reconciliation of Revenue and Profit or Loss from Segments to Consolidated [Line Items] |  |  |  |  |
Rental revenue | 0 | 0 | 0 | 0 |
Intercompany rental revenue | (22,983) | (20,828) | (55,189) | (51,402) |
Tenant expense reimbursement | 0 | 0 | 0 | 0 |
Observatory revenue | 0 | 0 | 0 | 0 |
Construction revenue |  |  |  | (3,715) |
Third-party management and other fees | 0 | 0 | 0 | 0 |
Other revenue and fees | 0 | 0 | 0 | 0 |
Total revenues | (22,983) | (20,828) | (55,189) | (55,117) |
Property operating expenses | 0 | 0 | 0 | 0 |
Intercompany rent expense | (22,983) | (20,828) | (55,189) | (51,402) |
Ground rent expenses | 0 | 0 | 0 | 0 |
General and administrative expenses | 0 | 0 | 0 | 0 |
Observatory expenses | 0 | 0 | 0 | 0 |
Construction expenses |  |  |  | (3,317) |
Real estate taxes | 0 | 0 | 0 | 0 |
Acquisition expenses |  | 0 | 0 | 0 |
Depreciation and amortization | 0 | 0 | 0 | 0 |
Total operating expenses | (22,983) | (20,828) | (55,189) | (54,719) |
Total operating income (loss) | 0 | 0 | 0 | (398) |
Interest expense | 0 | 0 | 0 | 0 |
Income (loss) before income taxes | 0 | 0 | 0 | (398) |
Income tax benefit (expense) | 0 | 0 | 0 | 0 |
Net income (loss) | 0 | 0 | 0 | (398) |
Segment assets | 0 | 0 | 0 | 0 |
Expenditures for segment assets | 0 | 0 | 0 | 0 |
Real Estate | Operating Segments |  |  |  |  |
Reconciliation of Revenue and Profit or Loss from Segments to Consolidated [Line Items] |  |  |  |  |
Rental revenue | 115,634 | 110,903 | 343,155 | 333,827 |
Intercompany rental revenue | 22,983 | 20,828 | 55,189 | 51,402 |
Tenant expense reimbursement | 19,176 | 23,096 | 56,350 | 59,878 |
Observatory revenue | 0 | 0 | 0 | 0 |
Construction revenue |  |  |  | 0 |
Third-party management and other fees | 404 | 618 | 1,372 | 1,658 |
Other revenue and fees | 2,536 | 5,460 | 6,738 | 10,565 |
Total revenues | 160,733 | 160,905 | 462,804 | 457,330 |
Property operating expenses | 38,585 | 41,052 | 115,075 | 120,341 |
Intercompany rent expense | 0 | 0 | 0 | 0 |
Ground rent expenses | 2,331 | 2,331 | 6,994 | 6,994 |
General and administrative expenses | 11,798 | 10,182 | 35,623 | 28,395 |
Observatory expenses | 0 | 0 | 0 | 0 |
Construction expenses |  |  |  | 0 |
Real estate taxes | 24,691 | 23,613 | 71,773 | 69,543 |
Acquisition expenses |  | 193 | 98 | 193 |
Depreciation and amortization | 37,421 | 45,072 | 115,002 | 125,847 |
Total operating expenses | 114,826 | 122,443 | 344,565 | 351,313 |
Total operating income (loss) | 45,907 | 38,462 | 118,239 | 106,017 |
Interest expense | (17,939) | (16,680) | (53,310) | (50,298) |
Income (loss) before income taxes | 27,968 | 21,782 | 64,929 | 55,719 |
Income tax benefit (expense) | (332) | (474) | (1,018) | (1,247) |
Net income (loss) | 27,636 | 21,308 | 63,911 | 54,472 |
Segment assets | 3,636,262 | 3,070,234 | 3,636,262 | 3,070,234 |
Expenditures for segment assets | 52,828 | 39,915 | 140,052 | 109,104 |
Observatory | Operating Segments |  |  |  |  |
Reconciliation of Revenue and Profit or Loss from Segments to Consolidated [Line Items] |  |  |  |  |
Rental revenue | 0 | 0 | 0 | 0 |
Intercompany rental revenue | 0 | 0 | 0 | 0 |
Tenant expense reimbursement | 0 | 0 | 0 | 0 |
Observatory revenue | 38,093 | 35,702 | 91,112 | 84,525 |
Construction revenue |  |  |  | 0 |
Third-party management and other fees | 0 | 0 | 0 | 0 |
Other revenue and fees | 5 | 0 | 10 | 0 |
Total revenues | 38,098 | 35,702 | 91,122 | 84,525 |
Property operating expenses | 0 | 0 | 0 | 0 |
Intercompany rent expense | 22,983 | 20,828 | 55,189 | 51,402 |
Ground rent expenses | 0 | 0 | 0 | 0 |
General and administrative expenses | 0 | 0 | 0 | 0 |
Observatory expenses | 7,250 | 7,896 | 21,900 | 23,391 |
Construction expenses |  |  |  | 0 |
Real estate taxes | 0 | 0 | 0 | 0 |
Acquisition expenses |  | 0 | 0 | 0 |
Depreciation and amortization | 186 | 97 | 380 | 268 |
Total operating expenses | 30,419 | 28,821 | 77,469 | 75,061 |
Total operating income (loss) | 7,679 | 6,881 | 13,653 | 9,464 |
Interest expense | 0 | 0 | 0 | 0 |
Income (loss) before income taxes | 7,679 | 6,881 | 13,653 | 9,464 |
Income tax benefit (expense) | (2,418) | (2,104) | (3,322) | (2,376) |
Net income (loss) | 5,261 | 4,777 | 10,331 | 7,088 |
Segment assets | 246,307 | 235,937 | 246,307 | 235,937 |
Expenditures for segment assets | $ 0 | 187 | $ 47 | 211 |
Other | Operating Segments |  |  |  |  |
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 |
Third-party management and other fees |  | 0 |  | 0 |
Other revenue and fees |  | 0 |  | 0 |
Total revenues |  | 0 |  | 5,696 |
Property operating expenses |  | 0 |  | 0 |
Intercompany rent expense |  | 0 |  | 0 |
Ground rent expenses |  | 0 |  | 0 |
General and administrative expenses |  | 0 |  | 0 |
Observatory expenses |  | 0 |  | 0 |
Construction expenses |  |  |  | 6,539 |
Real estate taxes |  | 0 |  | 0 |
Acquisition expenses |  | 0 |  | 0 |
Depreciation and amortization |  | 0 |  | 101 |
Total operating expenses |  | 0 |  | 6,640 |
Total operating income (loss) |  | 0 |  | (944) |
Interest expense |  | 0 |  | 0 |
Income (loss) before income taxes |  | 0 |  | (944) |
Income tax benefit (expense) |  | 0 |  | 340 |
Net income (loss) |  | 0 |  | (604) |
Segment assets |  | 2,596 |  | 2,596 |
Expenditures for segment assets |  | $ 0 |  | $ 0 |

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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=73531572&loc=d3e1043-128460 + Details
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- Definition The aggregate costs related to construction and development 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 210.5-03.2) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + 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=66902209&loc=d3e3602-108585 + Details
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- Definition Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68072869&loc=d3e41242-110953 Reference 2: 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(10)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(15)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(8)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 + Details
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- Definition Amount of the cost of borrowed funds accounted for as interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.9) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition Revenue, comprised of base and incentive revenue derived from the management of joint ventures, managing third-party properties, or another entity's operations. + 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(d)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Excludes Selling, General and Administrative Expense. + References No definition available. + Details
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- Definition Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense. + References No definition available. + Details
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- Definition The net result for the period of deducting operating expenses from operating revenues. + References No definition available. + 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=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 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 -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: 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=66902209&loc=d3e3213-108585 + Details
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- Definition The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4K -URI http://asc.fasb.org/extlink&oid=65897068&loc=SL4591552-111686 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=68079674&loc=SL4569616-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=64809438&loc=SL4573702-111684 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4J -URI http://asc.fasb.org/extlink&oid=65897068&loc=SL4591551-111686 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=64809438&loc=SL4573702-111684 + 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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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + 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) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc. + 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 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=68048583&loc=d3e3636-108311 + Details
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- Definition In accordance with the provisions of their lease agreement, this element represents allowable charges due a landlord from its tenant. In retail store and office building leases, for example, tenant reimbursements may cover items such as taxes, utilities, and common area expenses. + 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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