Acquisition and Disposition of Hotel Properties - Merger with LaSalle Hotel Properties - Narrative (Details) $ / shares in Units, $ in Thousands		12 Months Ended
	Nov. 30, 2018 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) $ / shares	Dec. 31, 2017 $ / shares
Business Acquisition [Line Items]
Common shares of beneficial interest, par value (usd per share) | $ / shares		$ 0.01	$ 0.01
Transaction costs | $		$ 72,700
Integration costs | $		2,000
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) | $ / shares	$ 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 | $		56,700
Operating income of acquired hotel properties since acquisition date | $		$ 15,900
LaSalle Hotel Properties
Business Acquisition [Line Items]
Common shares of beneficial interest, par value (usd per share) | $ / shares	$ 0.01
Series I preferred stock | LaSalle Hotel Properties
Business Acquisition [Line Items]
Preferred stock, dividend rate, percentage	6.375%
Preferred Series E shares
Business Acquisition [Line Items]
Preferred stock, dividend rate, percentage	6.375%	6.375%
Preferred Series E 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%
Preferred Series F shares
Business Acquisition [Line Items]
Preferred stock, dividend rate, percentage	6.30%	6.30%
Preferred Series F 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	61,399,104
Equity interests issued (in usd per share) | $ / shares	$ 34.92
Preferred shares | Preferred Series E shares | LaSalle Hotel Properties
Business Acquisition [Line Items]
Equity interests issued (in shares) | shares	4,400,000
Equity interests issued (in usd per share) | $ / shares	$ 23.10
Preferred shares | Preferred Series F shares | LaSalle Hotel Properties
Business Acquisition [Line Items]
Equity interests issued (in shares) | shares	6,000,000
Equity interests issued (in usd per share) | $ / shares	$ 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) | $ / shares	$ 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
Loss on investment prior to acquisition | $	$ 3,300