Related Party Transactions Registration Rights (Details) (Investor [Member], USD $)	12 Months Ended
Dec. 31, 2014 offering
Related Party Transaction [Line Items]
Minimum market value of registrable shares	$ 150,000,000
Maximum number of underwritten offerings obligated to effect	4
Share value cut back threshold	25,000,000
Maximum reimbursement of liabilities arising under the Securities Act	25,000
Reimbursement of liabilities arising under the Securities Act	$ (500,000.0)
ESRT [Member]
Related Party Transaction [Line Items]
Maximum number of underwritten offerings obligated to effect in a 12 month period	2
Maximum number of underwritten offerings obligated to effect period	12 months

Related Party Transaction, Minimum Market Value of Registrable Shares

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Related Party Transaction, Number of Underwritten Offerings Obligated to Effect in Twelve Month Period, Maximum

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Related Party Transaction, Number of Underwritten Offerings Obligated to Effect, Maximum

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Related Party Transaction, Number of Underwritten Offerings Obligated to Effect, Maximum, Period

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Related Party Transaction, Reimbursement of Liabilities Arising Under the Securities Act

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Related Party Transaction, Reimbursement of Liabilities Arising Under the Securities Act, Maximum

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Related Party Transaction, Share Value Cut Back Threshold

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