Debt (Details Textual) - USD ($) $ in Thousands						12 Months Ended
		Jun. 01, 2017	Mar. 01, 2017	Jan. 05, 2016	Nov. 12, 2015	Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015	Oct. 13, 2017	Jul. 13, 2017	May 17, 2017	Jun. 10, 2015	Apr. 13, 2015	Apr. 12, 2015
Line of Credit Facility [Line Items]
Outstanding borrowings under the credit facility						$ 45,000		$ 82,000
Debt outstanding						890,573
Borrowings under revolving credit facilities						238,687		469,000		$ 490,000
Unrealized gain (loss) on derivative instruments						6,001		2,438		(4,409)
Gain (Loss) on derivative instruments						(265)		(283)		0
Repayments of mortgage debt						72,317		365,583		171,488
Estimated fair value of debt						167,100		242,900
First Mortgage [Member]
Line of Credit Facility [Line Items]
Debt outstanding						70,573		142,890
First Mortgage [Member] | Sofitel Philadelphia [Member]
Line of Credit Facility [Line Items]
Debt outstanding						$ 0		44,320
Stated interest rate						3.90%
Repayments of mortgage debt			$ 44,100
First Mortgage [Member] | Hotel Zelos San Francisco [Member]
Line of Credit Facility [Line Items]
Debt outstanding						$ 0		25,718
Stated interest rate						5.94%
Repayments of mortgage debt		$ 25,500
Interest Rate Swap [Member]
Line of Credit Facility [Line Items]
Derivative Asset						$ 5,260
Derivative Liability						1,000
Unrealized gain (loss) on derivative instruments						6,001		2,438		(4,409)
Gain (Loss) on derivative instruments						(265)		(283)		0
Reclassification from AOCI to interest expense						3,400		6,200		5,400
Expected reclassifications in next 12 months						100
Term Loan [Member]
Line of Credit Facility [Line Items]
Debt outstanding						675,000		675,000
Unsecured Debt [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Debt outstanding						45,000		82,000
Senior Unsecured Revolving Credit Facility [Member] | Unsecured Debt [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity						750,000
Senior Unsecured Revolving Credit Facility [Member] | Unsecured Debt [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity						450,000
Accordion feature (potential increase)						1,300,000
Outstanding borrowings under the credit facility						45,000		82,000
Line of credit facility, remaining borrowing capacity						405,000
Unused commitment fees						1,000		1,000		$ 600
Debt outstanding	[1]					$ 45,000		82,000
Senior Unsecured Revolving Credit Facility [Member] | Unsecured Debt [Member] | Revolving Credit Facility [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Annual rate of unused commitment fee						0.20%
Senior Unsecured Revolving Credit Facility [Member] | Unsecured Debt [Member] | Revolving Credit Facility [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Credit facility borrowings LIBOR rate plus						1.45%
Senior Unsecured Revolving Credit Facility [Member] | Unsecured Debt [Member] | Revolving Credit Facility [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Annual rate of unused commitment fee						0.30%
Senior Unsecured Revolving Credit Facility [Member] | Unsecured Debt [Member] | Revolving Credit Facility [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Credit facility borrowings LIBOR rate plus						2.25%
Senior Unsecured Revolving Credit Facility [Member] | Unsecured Debt [Member] | Term Loan [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity						$ 300,000
PHL Unsecured Revolving Credit Facility [Member] | Unsecured Debt [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity													$ 10,000
Outstanding borrowings under the credit facility								0
Line of credit facility, remaining borrowing capacity						10,000
Debt outstanding	[2]					$ 0		0
PHL Unsecured Revolving Credit Facility [Member] | Unsecured Debt [Member] | Revolving Credit Facility [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Annual rate of unused commitment fee						0.20%
PHL Unsecured Revolving Credit Facility [Member] | Unsecured Debt [Member] | Revolving Credit Facility [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Credit facility borrowings LIBOR rate plus						1.45%
PHL Unsecured Revolving Credit Facility [Member] | Unsecured Debt [Member] | Revolving Credit Facility [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Annual rate of unused commitment fee						0.30%
PHL Unsecured Revolving Credit Facility [Member] | Unsecured Debt [Member] | Revolving Credit Facility [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Credit facility borrowings LIBOR rate plus						2.25%
First Term Loan [Member] | Interest Rate Swap [Member]
Line of Credit Facility [Line Items]
Notional amount						$ 300,000
First Term Loan [Member] | Term Loan [Member]
Line of Credit Facility [Line Items]
Debt outstanding	[3]					$ 300,000		300,000
First Term Loan [Member] | Term Loan [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Credit facility borrowings LIBOR rate plus						1.40%
First Term Loan [Member] | 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%
Second Term Loan [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity				$ 175,000		$ 150,000									$ 200,000	$ 100,000
Borrowings under revolving credit facilities				75,000
Second Term Loan [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Credit facility borrowings LIBOR rate plus						1.40%
Second Term Loan [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Credit facility borrowings LIBOR rate plus						2.20%
Second Term Loan [Member] | Term Loan [Member]
Line of Credit Facility [Line Items]
Debt outstanding						$ 65,000	[3]	175,000	[3]		$ 65,000
Second Term Loan, Excluded from Interest Rate Swap [Member] | Term Loan [Member]
Line of Credit Facility [Line Items]
Term loans outstanding						65,000		75,000
Fourth Term Loan [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity						250,000
Fourth Term Loan [Member] | Interest Rate Swap [Member]
Line of Credit Facility [Line Items]
Notional amount						$ 100,000
Fourth 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%
Fourth Term Loan [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Credit facility borrowings LIBOR rate plus						2.60%
Fourth Term Loan [Member] | Term Loan [Member]
Line of Credit Facility [Line Items]
Debt outstanding						$ 110,000	[3]	0	[3]		$ 110,000
Fourth Term Loan [Member] | Term Loan [Member] | Interest Rate Swap [Member]
Line of Credit Facility [Line Items]
Effective interest rate						3.46%
Fourth Term Loan Excluded From Interest Rate Swap Member [Member] | Term Loan [Member]
Line of Credit Facility [Line Items]
Term loans outstanding						$ 10,000
Third Term Loan [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity				200,000										$ 125,000
Accordion feature (potential increase)														$ 250,000
Borrowings under revolving credit facilities				$ 75,000
Third Term Loan [Member] | Interest Rate Swap [Member]
Line of Credit Facility [Line Items]
Notional amount						$ 200,000
Third Term Loan [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Credit facility borrowings LIBOR rate plus						1.40%
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%
Third Term Loan [Member] | Term Loan [Member]
Line of Credit Facility [Line Items]
Debt outstanding	[3]					$ 200,000		$ 200,000
Third Term Loan [Member] | Term Loan [Member] | Interest Rate Swap [Member]
Line of Credit Facility [Line Items]
Effective interest rate						3.11%
Series A Notes [Member]
Line of Credit Facility [Line Items]
Proceeds from issuance of senior long-term debt					$ 60,000
Stated interest rate					4.70%	4.70%
Series B Notes [Member]
Line of Credit Facility [Line Items]
Proceeds from issuance of senior long-term debt					$ 40,000
Stated interest rate					4.93%	4.93%
Term Loan Through July 12, 2017 [Member] | Term Loan [Member] | Interest Rate Swap [Member]
Line of Credit Facility [Line Items]
Effective interest rate												2.83%
Term Loan July 13, 2017 through January 15, 2020 [Member] | Term Loan [Member] | Interest Rate Swap [Member]
Line of Credit Facility [Line Items]
Effective interest rate						3.36%

[1] Borrowings bear interest at floating rates equal to, at the Company's option, either (i) LIBOR plus an applicable margin or (ii) an Adjusted Base Rate (as defined in the applicable credit agreement) plus an applicable margin.

[2] Borrowings bear interest at floating rates equal to, at the Company's option, either (i) LIBOR plus an applicable margin or (ii) an Eurocurrency Rate (as defined in the applicable credit agreement) plus an applicable margin.

[3] Borrowings under the term loan facilities bear interest at floating rates equal to, at the Company's option, either (i) LIBOR plus an applicable margin or (ii) a Base Rate plus an applicable margin. At December 31, 2017, the Company had interest rate swaps to effectively fix the interest rate for the First Term Loan, the Third Term Loan and a portion of the Fourth Term Loan. The Company had interest rate swaps on the full amounts outstanding, except for $65.0 million on the Second Term Loan and $10.0 million on the Fourth Term Loan. At December 31, 2016, the Company had interest rate swaps on all of the Term Loans, except for $75.0 million on the Second Term Loan. See "Derivative and Hedging Activities" above.