Debt - Components of Mortgage Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Participating Mortgage Loans [Line Items]
Carrying Value	$ 680,433
Balance Outstanding	586,860	$ 585,055
Unamortized mortgage debt issue costs	(1,395)	(1,773)
Total debt outstanding	$ 585,465	583,282
Senior Unsecured Revolving Credit Facility
Participating Mortgage Loans [Line Items]
Interest Rate	4.31%
Carrying Value	$ 0
Balance Outstanding	$ 90,000	81,500
Residence Inn by Marriott New Rochelle, NY
Participating Mortgage Loans [Line Items]
Interest Rate	5.75%
Carrying Value	$ 18,756
Balance Outstanding	$ 12,936	13,361
Residence Inn by Marriott San Diego, CA
Participating Mortgage Loans [Line Items]
Interest Rate	4.66%
Carrying Value	$ 44,939
Balance Outstanding	$ 27,272	27,885
Homewood Suites by Hilton San Antonio, TX
Participating Mortgage Loans [Line Items]
Interest Rate	4.59%
Carrying Value	$ 29,914
Balance Outstanding	$ 15,563	15,916
Residence Inn by Marriott Vienna, VA
Participating Mortgage Loans [Line Items]
Interest Rate	4.49%
Carrying Value	$ 32,006
Balance Outstanding	$ 21,291	21,782
Courtyard by Marriott Houston, TX
Participating Mortgage Loans [Line Items]
Interest Rate	4.19%
Carrying Value	$ 31,158
Balance Outstanding	$ 17,559	17,976
Hyatt Place Pittsburgh, PA
Participating Mortgage Loans [Line Items]
Interest Rate	4.65%
Carrying Value	$ 34,941
Balance Outstanding	$ 21,520	21,989
Residence Inn by Marriott Bellevue, WA
Participating Mortgage Loans [Line Items]
Interest Rate	4.97%
Carrying Value	$ 64,015
Balance Outstanding	$ 43,857	44,680
Residence Inn by Marriott Garden Grove, CA
Participating Mortgage Loans [Line Items]
Interest Rate	4.79%
Carrying Value	$ 38,793
Balance Outstanding	$ 32,053	32,620
Residence Inn by Marriott Silicon Valley I, CA
Participating Mortgage Loans [Line Items]
Interest Rate	4.64%
Carrying Value	$ 79,377
Balance Outstanding	$ 64,406	64,800
Residence Inn by Marriott Silicon Valley II, CA
Participating Mortgage Loans [Line Items]
Interest Rate	4.64%
Carrying Value	$ 85,006
Balance Outstanding	$ 70,270	70,700
Residence Inn by Marriott San Mateo, CA
Participating Mortgage Loans [Line Items]
Interest Rate	4.64%
Carrying Value	$ 64,718
Balance Outstanding	$ 48,305	48,600
Residence Inn by Marriott Mountain View, CA
Participating Mortgage Loans [Line Items]
Interest Rate	4.64%
Carrying Value	$ 52,677
Balance Outstanding	$ 37,670	37,900
SpringHill Suites by Marriott Savannah, GA
Participating Mortgage Loans [Line Items]
Interest Rate	4.62%
Carrying Value	$ 34,567
Balance Outstanding	$ 29,817	30,000
Hilton Garden Inn Marina del Rey, CA
Participating Mortgage Loans [Line Items]
Interest Rate	4.68%
Carrying Value	$ 39,200
Balance Outstanding	$ 20,931	21,355
Homewood Suites by Hilton Billerica, MA
Participating Mortgage Loans [Line Items]
Interest Rate	4.32%
Carrying Value	$ 13,956
Balance Outstanding	$ 15,693	15,965
Hampton Inn & Suites Houston Medical Cntr., TX
Participating Mortgage Loans [Line Items]
Interest Rate	4.25%
Carrying Value	$ 16,410
Balance Outstanding	$ 17,717	$ 18,026