Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013		Dec. 31, 2012
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 260		$ 28
Mortgage loan premium	6,270	[1]	2,498	[1]
Preferred shares of beneficial interest, liquidation preference value	$ 325,000		$ 225,000
Preferred shares of beneficial interest, par value	$ 0.01		$ 0.01
Preferred shares of beneficial interest, shares authorized	100,000,000		100,000,000
Preferred shares of beneficial interest, shares issued	13,000,000		9,000,000
Preferred shares of beneficial interest, shares outstanding	13,000,000		9,000,000
Common shares of beneficial interest, par value	$ 0.01		$ 0.01
Common shares of beneficial interest, shares authorized	500,000,000		500,000,000
Common shares of beneficial interest, shares issued	61,179,628		60,955,090
Common shares of beneficial interest, shares outstanding	61,179,628		60,955,090

[1] Loan premiums on assumed mortgages recorded in purchase accounting and secured by the leasehold interest on the Hotel Palomar San Francisco, Embassy Suites San Diego Bay - Downtown and Hotel Modera as of September 30, 2013 and the Hotel Palomar San Francisco as of December 31, 2012.