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Debt - Schedule of Long Term Debt (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Principal Balance	$ 944,434,000
Total mortgage debt, net of unamortized debt issuance costs	639,639,000		$ 821,167,000
Senior unsecured credit facility	0
Total debt	$ 937,792,000		920,539,000
Weighted-Average Interest Rate	3.79%
Unsecured Term Loan Due May 2021
Debt Instrument [Line Items]
Interest rate at period end		2.81%
Mortgages
Debt Instrument [Line Items]
Unamortized debt issuance costs	$ (4,795,000)		(6,052,000)
Total mortgage debt, net of unamortized debt issuance costs	639,639,000		821,167,000
Unsecured term loan
Debt Instrument [Line Items]
Unamortized debt issuance costs	(1,847,000)		(628,000)
Total debt	$ 298,153,000		99,372,000
Unsecured term loan | Unsecured Term Loan Due May 2021
Debt Instrument [Line Items]
Interest rate description	LIBOR + 1.45% (2)
Principal Balance	$ 100,000,000		100,000,000
Unsecured term loan | Unsecured Term Loan Due May 2021 | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.45%
Unsecured term loan | Unsecured Term Loan Due April 2022
Debt Instrument [Line Items]
Interest rate description	LIBOR + 1.45% (2)
Principal Balance	$ 200,000,000		0
Unsecured term loan | Unsecured Term Loan Due April 2022 | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.94%
Senior unsecured credit facility
Debt Instrument [Line Items]
Interest rate description	LIBOR + 1.50%
Senior unsecured credit facility	$ 0		0
Senior unsecured credit facility | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.50%
Lexington Hotel New York Tenant Leases | Mortgages
Debt Instrument [Line Items]
Interest rate description	LIBOR + 2.25%
Principal Balance	$ 0		170,368,000
Lexington Hotel New York Tenant Leases | Mortgages | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	2.25%
Salt Lake City Marriott Downtown | Mortgages
Debt Instrument [Line Items]
Interest Rate	4.25%
Amortization Provisions	25 years
Principal Balance	$ 56,717,000		58,331,000
Westin Washington D.C. City Center | Mortgages
Debt Instrument [Line Items]
Interest Rate	3.99%
Amortization Provisions	25 years
Principal Balance	$ 64,833,000		66,848,000
The Lodge at Sonoma, a Renaissance Resort & Spa | Mortgages
Debt Instrument [Line Items]
Interest Rate	3.96%
Amortization Provisions	30 years
Principal Balance	$ 28,277,000		28,896,000
Westin San Diego | Mortgages
Debt Instrument [Line Items]
Interest Rate	3.94%
Amortization Provisions	30 years
Principal Balance	$ 64,859,000		66,276,000
Courtyard Manhattan / Midtown East | Mortgages
Debt Instrument [Line Items]
Interest Rate	4.40%
Amortization Provisions	30 years
Principal Balance	$ 84,067,000		85,451,000
Renaissance Worthington | Mortgages
Debt Instrument [Line Items]
Interest Rate	3.66%
Amortization Provisions	30 years
Principal Balance	$ 84,116,000		85,000,000
JW Marriott Denver at Cherry Creek | Mortgages
Debt Instrument [Line Items]
Interest Rate	4.33%
Amortization Provisions	30 years
Principal Balance	$ 63,519,000		64,579,000
Boston Westin | Mortgages
Debt Instrument [Line Items]
Interest Rate	4.36%
Amortization Provisions	30 years
Principal Balance	$ 198,046,000		$ 201,470,000

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions).

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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