Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Allowance for doubtful accounts		$ 243	$ 139
Mortgage loan premium	[1]	1,581	4,026
Preferred shares of beneficial interest, liquidation preference value		$ 350,000	$ 350,000
Preferred shares of beneficial interest, par value (usd per share)		$ 0.01	$ 0.01
Preferred shares of beneficial interest, shares authorized		100,000,000	100,000,000
Preferred shares of beneficial interest, shares issued		14,000,000	14,000,000
Preferred shares of beneficial interest, shares outstanding		14,000,000	14,000,000
Common shares of beneficial interest, par value (usd per share)		$ 0.01	$ 0.01
Common shares of beneficial interest, shares authorized		500,000,000	500,000,000
Common shares of beneficial interest, shares issued		71,735,129	71,553,481
Common shares of beneficial interest, shares outstanding		71,735,129	71,553,481

[1] Loan premiums on assumed mortgages recorded in purchase accounting for the Hotel Zelos (formerly Hotel Palomar San Francisco); Embassy Suites San Diego Bay - Downtown; Hotel Modera; and The Nines, a Luxury Collection Hotel, Portland.