Fair Value Measurements and Interest Rate Derivatives - Fair Value Measurements (Details)		3 Months Ended			9 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2011 item
Fair value of assets and liabilities measured at fair value on a recurring and nonrecurring basis
Impairment loss		$ 34,427,000			$ 34,427,000
Assets:
Investment in hotel properties, net	$ 3,235,053,000	3,235,053,000			3,235,053,000		$ 3,158,219,000
Interest rate derivatives	1,463,000	1,463,000			1,463,000		1,749,000
Former Chairman
Liabilities:
Number of installments to be paid out under the Retirement Benefit Agreement | item								10
Total amount paid to date under the Retirement Benefit Agreement	1,400,000
Level 2
Assets:
Life insurance policy	649,000	649,000			649,000		861,000
Total assets	2,112,000	2,112,000			2,112,000		2,610,000
Liabilities:
Retirement benefit agreement	649,000	649,000			649,000		861,000
Total liabilities	649,000	649,000			649,000		861,000
Level 2 | Interest Rate Swap
Assets:
Interest rate derivatives	1,463,000	1,463,000			1,463,000		1,749,000
Level 3
Assets:
Total assets	37,912,000	37,912,000			37,912,000
Total at the end of the period
Assets:
Life insurance policy	649,000	649,000			649,000		861,000
Total assets	40,024,000	40,024,000			40,024,000		2,610,000
Liabilities:
Retirement benefit agreement	649,000	649,000			649,000		861,000
Total liabilities	649,000	649,000			649,000		861,000
Total at the end of the period | Interest Rate Swap
Assets:
Interest rate derivatives	1,463,000	1,463,000			1,463,000		$ 1,749,000
Houston Hotels
Fair value of assets and liabilities measured at fair value on a recurring and nonrecurring basis
Impairment loss		34,400,000	$ 0			$ 0
Houston Hotels | Level 3
Fair value of assets and liabilities measured at fair value on a recurring and nonrecurring basis
Impairment loss				$ 34,400,000
Assets:
Investment in hotel properties, net	37,912,000	37,912,000			37,912,000
Houston Hotels | Total at the end of the period
Assets:
Investment in hotel properties, net	$ 37,912,000	37,912,000			$ 37,912,000
Hilton North Houston
Fair value of assets and liabilities measured at fair value on a recurring and nonrecurring basis
Impairment loss		27,100,000
Hilton North Houston | Level 3
Fair value of assets and liabilities measured at fair value on a recurring and nonrecurring basis
Impairment loss				27,100,000
Marriott Houston
Fair value of assets and liabilities measured at fair value on a recurring and nonrecurring basis
Impairment loss		$ 7,300,000
Marriott Houston | Level 3
Fair value of assets and liabilities measured at fair value on a recurring and nonrecurring basis
Impairment loss				$ 7,300,000