Business Combinations and Acquisition and Disposition of Hotel Properties - Merger with LaSalle Hotel Properties - Narrative (Details) $ / shares in Units, $ in Thousands		3 Months Ended	6 Months Ended
	Nov. 30, 2018 USD ($) $ / shares shares	Jun. 30, 2019 USD ($) $ / shares	Jun. 30, 2019 USD ($) $ / shares	Dec. 31, 2018 $ / shares
Business Acquisition [Line Items]
Common shares of beneficial interest, par value (usd per share)		$ 0.01	$ 0.01	$ 0.01
Transaction costs | $		$ 100	$ 300
Integration costs | $		900	3,100
LaSalle Hotel Properties
Business Acquisition [Line Items]
Common exchange ratio, right to receive shares for each share of common stock	0.92
Right to receive cash in lieu of common shares (in usd per share)	$ 37.80
Maximum percentage of shares available to convert to cash	30.00%
Total consideration | $	$ 4,102,094
Revenues of acquired hotel properties since acquisition date | $		236,000	420,000
Operating income of acquired hotel properties since acquisition date | $		$ 106,100	$ 169,300
LaSalle Hotel Properties
Business Acquisition [Line Items]
Common shares of beneficial interest, par value (usd per share)	$ 0.01
Series I preferred stock | LaSalle Hotel Properties
Business Acquisition [Line Items]
Preferred stock, dividend rate, percentage	6.375%
Series E preferred shares
Business Acquisition [Line Items]
Preferred stock, dividend rate, percentage	6.375%		6.375%
Series E preferred shares | LaSalle Hotel Properties
Business Acquisition [Line Items]
Preferred exchange ratio, right to receive shares for each share of common stock	1
Series J preferred stock | LaSalle Hotel Properties
Business Acquisition [Line Items]
Preferred stock, dividend rate, percentage	6.30%
Series F preferred shares
Business Acquisition [Line Items]
Preferred stock, dividend rate, percentage	6.30%		6.30%
Series F preferred shares | LaSalle Hotel Properties
Business Acquisition [Line Items]
Preferred exchange ratio, right to receive shares for each share of common stock	1
Common Shares | LaSalle Hotel Properties
Business Acquisition [Line Items]
Equity interests issued (in shares) | shares	61,400,000
Equity interests issued (in usd per share)	$ 34.92
Preferred shares | Series E preferred shares | LaSalle Hotel Properties
Business Acquisition [Line Items]
Equity interests issued (in shares) | shares	4,400,000
Equity interests issued (in usd per share)	$ 23.10
Preferred shares | Series F preferred shares | LaSalle Hotel Properties
Business Acquisition [Line Items]
Equity interests issued (in shares) | shares	6,000,000
Equity interests issued (in usd per share)	$ 22.10
Operating partnership units | LaSalle Hotel Properties
Business Acquisition [Line Items]
Equity interests issued (in shares) | shares	133,605
Equity interests issued (in usd per share)	$ 34.92
LaSalle Hotel Properties
Business Acquisition [Line Items]
Common shares held prior to acquisition (in shares) | shares	10,800,000
Value of common shares held prior to acquisition | $	$ 346,500