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Subsequent Events Subsequent Events (Details) (USD $) | 0 Months Ended | 3 Months Ended | 9 Months Ended |  | 9 Months Ended | 0 Months Ended |  | 0 Months Ended |  | 0 Months Ended |  | 0 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended
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Jul. 15, 2014 | Sep. 30, 2014 | Sep. 30, 2014 | Sep. 30, 2014 Mortgages [Member] | Sep. 30, 2014 Floating Rate Debt - 1350 Broadway - 2nd Lien Mortgage Loan [Member] Mortgages [Member] | Oct. 01, 2014 Floating Rate Debt - 1350 Broadway - 2nd Lien Mortgage Loan [Member] Mortgages [Member] Subsequent Event [Member] | Sep. 30, 2014 Metro Center [Member] Mortgages [Member] | Oct. 01, 2014 Metro Center [Member] Mortgages [Member] Subsequent Event [Member] | Oct. 01, 2014 Metro Center [Member] Mortgages [Member] Subsequent Event [Member] | Oct. 01, 2014 Floating Rate Debt, One Grand Central Place - Fourth Lien [Member] Mortgages [Member] Subsequent Event [Member] loan | Oct. 01, 2014 Floating Rate Debt, One Grand Central Place - Fourth Lien [Member] Mortgages [Member] Subsequent Event [Member] | Oct. 01, 2014 LIBOR [Member] Floating Rate Debt, One Grand Central Place - Fourth Lien [Member] Mortgages [Member] Subsequent Event [Member] | Sep. 30, 2014 Real Estate, Segment [Member] | Sep. 30, 2013 Real Estate, Segment [Member] | Sep. 30, 2014 Real Estate, Segment [Member] | Sep. 30, 2013 Real Estate, Segment [Member] | Sep. 30, 2014 Observatory, Segment [Member] [Member] | Sep. 30, 2014 Observatory, Segment [Member] [Member] | Sep. 30, 2014 Other Segments [Member] | Sep. 30, 2013 Other Segments [Member] | Sep. 30, 2014 Other Segments [Member] | Sep. 30, 2013 Other Segments [Member] | Sep. 30, 2014 Total, Segment [Member] | Sep. 30, 2013 Total, Segment [Member] | Sep. 30, 2014 Total, Segment [Member] | Sep. 30, 2013 Total, Segment [Member]
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Expense (Benefit) |  | $ 3,004,000 | $ 4,153,000 |  |  |  |  |  |  |  |  |  | $ (371,000) |  | $ (1,024,000) |  | $ (2,970,000) | $ (3,035,000) | $ (75,000) |  | $ (94,000) |  | $ (3,416,000) |  | $ (4,153,000) |
Interest expense |  | (17,674,000) | (46,640,000) |  |  |  |  |  |  |  |  |  | (17,674,000) | (14,906,000) | (46,640,000) | (43,817,000) | 0 | 0 | 0 | 0 | 0 | 0 | (17,674,000) | (14,906,000) | (46,640,000) | (43,817,000)
Repayments of Long-term Debt |  |  | 57,478,000 |  | 13,700,000 | 13,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration paid | 733,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from credit facility |  |  | 295,600,000 |  |  |  |  | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months |  |  |  | 108,137,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated Rate |  |  |  |  |  |  | 5.89% |  | 3.59% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Number of Instruments Refinanced |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  | $ 91,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  |  |  |  | 1.35% |  |  |  |  |  |  |  |  |  |  |  |  |  |

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