Debt (Details Textual)			3 Months Ended
	Mar. 01, 2017 USD ($)	Nov. 12, 2015 USD ($)	Mar. 31, 2017 USD ($) extension_option	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)	Jun. 10, 2015 USD ($)	May 19, 2015 USD ($)	Apr. 13, 2015 USD ($)
Line of Credit Facility [Line Items]
Outstanding borrowings under the credit facility			$ 204,000,000		$ 82,000,000
Unrealized gain (loss) on derivative instruments			2,104,000	$ (11,484,000)
Gain (Loss) on derivative instruments			64,000	(1,771,000)
Repayments of mortgage debt			44,996,000	1,953,000
Estimated fair value of debt			197,100,000		242,900,000
Interest Rate Swap [Member]
Line of Credit Facility [Line Items]
Derivative Asset			2,100,000
Derivative Liability			2,000,000
Reclassification from AOCI to interest expense			1,100,000	1,600,000
Expected reclassifications in next 12 months			2,800,000
First Term Loan [Member] | Interest Rate Swap [Member]
Line of Credit Facility [Line Items]
Notional amount			300,000,000
Second Term Loan [Member]
Line of Credit Facility [Line Items]
Borrowing capacity					175,000,000			$ 100,000,000
Maximum borrowing capacity								$ 200,000,000
Second Term Loan [Member] | Interest Rate Swap [Member]
Line of Credit Facility [Line Items]
Notional amount			$ 100,000,000
Second Term Loan [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Credit facility borrowings LIBOR rate plus			1.70%
Second Term Loan [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Credit facility borrowings LIBOR rate plus			2.55%
Second Term Loan, Excluded from Interest Rate Swap [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Credit facility borrowings LIBOR rate plus			1.70%
Second Term Loan, Excluded from Interest Rate Swap [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Credit facility borrowings LIBOR rate plus			2.55%
Third Term Loan [Member]
Line of Credit Facility [Line Items]
Borrowing capacity					200,000,000	$ 125,000,000
Maximum borrowing capacity						$ 250,000,000
Third Term Loan [Member] | Interest Rate Swap [Member]
Line of Credit Facility [Line Items]
Notional amount			$ 200,000,000
Third Term Loan [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Credit facility borrowings LIBOR rate plus			1.45%
Third Term Loan [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Credit facility borrowings LIBOR rate plus			2.20%
Series A Notes [Member]
Line of Credit Facility [Line Items]
Proceeds from issuance of senior long-term debt		$ 60,000,000
Stated interest rate			4.70%
Series B Notes [Member]
Line of Credit Facility [Line Items]
Proceeds from issuance of senior long-term debt		$ 40,000,000
Stated interest rate			4.93%
Revolving Credit Facility [Member] | Senior Unsecured Revolving Credit Facility [Member] | Unsecured Debt [Member]
Line of Credit Facility [Line Items]
Borrowing capacity			$ 450,000,000				$ 750,000,000
Maximum borrowing capacity			1,000,000,000
Outstanding borrowings under the credit facility			204,000,000		82,000,000
Line of credit facility, remaining borrowing capacity			246,000,000
Unused commitment fees			$ 200,000	$ 300,000
Number of Extension Options | extension_option			2
Extension Option Duration			6 months
Revolving Credit Facility [Member] | Senior Unsecured Revolving Credit Facility [Member] | Unsecured Debt [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Annual rate of unused commitment fee			0.20%
Revolving Credit Facility [Member] | Senior Unsecured Revolving Credit Facility [Member] | Unsecured Debt [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Credit facility borrowings LIBOR rate plus			1.55%
Revolving Credit Facility [Member] | Senior Unsecured Revolving Credit Facility [Member] | Unsecured Debt [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Annual rate of unused commitment fee			0.30%
Revolving Credit Facility [Member] | Senior Unsecured Revolving Credit Facility [Member] | Unsecured Debt [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Credit facility borrowings LIBOR rate plus			2.30%
Term Loan [Member]
Line of Credit Facility [Line Items]
Term loans			$ 675,000,000		675,000,000
Term Loan [Member] | Senior Unsecured Revolving Credit Facility [Member] | Unsecured Debt [Member]
Line of Credit Facility [Line Items]
Borrowing capacity			300,000,000
Term Loan [Member] | First Term Loan [Member]
Line of Credit Facility [Line Items]
Term loans			$ 300,000,000		300,000,000
Term Loan [Member] | First Term Loan [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Credit facility borrowings LIBOR rate plus			1.50%
Term Loan [Member] | First Term Loan [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Credit facility borrowings LIBOR rate plus			2.25%
Term Loan [Member] | Second Term Loan [Member]
Line of Credit Facility [Line Items]
Term loans			$ 175,000,000		175,000,000
Term Loan [Member] | Second Term Loan [Member] | Interest Rate Swap [Member]
Line of Credit Facility [Line Items]
Weighted average interest rate			3.36%
Term Loan [Member] | Second Term Loan, Excluded from Interest Rate Swap [Member]
Line of Credit Facility [Line Items]
Term loans			$ 75,000,000		75,000,000
Term Loan [Member] | Third Term Loan [Member]
Line of Credit Facility [Line Items]
Term loans			$ 200,000,000		$ 200,000,000
Term Loan [Member] | Third Term Loan [Member] | Interest Rate Swap [Member]
Line of Credit Facility [Line Items]
Weighted average interest rate			3.11%
Term Loan [Member] | Term Loan Through July 12, 2017 [Member] | Interest Rate Swap [Member]
Line of Credit Facility [Line Items]
Effective interest rate			2.83%
Term Loan [Member] | Term Loan July 13, 2017 through January 15, 2020 [Member] | Interest Rate Swap [Member]
Line of Credit Facility [Line Items]
Weighted average interest rate			3.41%
First Mortgage [Member] | Sofitel Philadelphia [Member]
Line of Credit Facility [Line Items]
Stated interest rate			3.90%
Repayments of mortgage debt	$ 44,100,000