Investment in Hotel Properties (Details 3) (USD $)	3 Months Ended								12 Months Ended			1 Months Ended		0 Months Ended						12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jul. 31, 2013	Jun. 30, 2012	May 01, 2013	Jul. 02, 2013	Dec. 02, 2013	Jun. 04, 2012	May 02, 2012	Jul. 19, 2012	Dec. 31, 2011
Investment in Hotel Properties
Total revenues	$ 289,880,000	$ 307,783,000	$ 300,852,000	$ 243,483,000	$ 243,895,000	$ 250,370,000	$ 234,638,000	$ 194,921,000	$ 1,141,998,000	$ 923,824,000	$ 829,084,000
NET INCOME	14,257,000	33,643,000	43,535,000	(3,496,000)	5,249,000	15,817,000	20,009,000	28,926,000	87,939,000	70,001,000	49,557,000
Unaudited pro forma results of operations
Revenues									1,175,367,000	1,100,354,000	1,063,094,000
Income available (loss attributable) to common stockholders from continuing operations									74,811,000	19,931,000	(9,742,000)
Income (loss) per diluted share available (attributable) to common stockholders from continuing operations									$ 0.39	$ 0.12	$ (0.08)
Boston Park Plaza | Non-recourse loan secured
Investment in Hotel Properties
Debt assumed at acquisition												119,200,000
Hyatt Chicago Magnificent Mile
Investment in Hotel Properties
Number of shares issued in connection with acquisition (in shares)													5,454,164
Acquisitions 2014
Investment in Hotel Properties
Total revenues									27,000,000
NET INCOME									3,500,000
Acquisitions 2013
Investment in Hotel Properties
Total revenues										51,000,000
NET INCOME										2,800,000
Acquisitions 2013 | Hilton New Orleans St. Charles
Investment in Hotel Properties
Number of rooms in acquired hotel														250
Purchase price of acquired entity														59,100,000
Proration and other credits														200,000
Acquisition-related costs										400,000
Total proceeds held by accomodator to facilitate tax deferred exchange														53,200,000
Acquisitions 2013 | Boston Park Plaza
Investment in Hotel Properties
Number of rooms in acquired hotel															1,053
Purchase price of acquired entity															248,000,000
Proration and other credits															2,000,000
Acquisition-related costs										900,000
Total proceeds held by accomodator to facilitate tax deferred exchange															92,300,000
Acquisitions 2013 | Boston Park Plaza | Non-recourse loan secured
Investment in Hotel Properties
Debt assumed at acquisition															119,200,000
Acquisitions 2013 | Hyatt Regency San Francisco
Investment in Hotel Properties
Number of rooms in acquired hotel																802
Purchase price of acquired entity																262,500,000
Proration and other credits																5,500,000
Acquisition-related costs										500,000
Acquisitions 2012
Investment in Hotel Properties
Total revenues											27,700,000
NET INCOME											(1,100,000)
Acquisitions 2012 | Hyatt Chicago Magnificent Mile
Investment in Hotel Properties
Number of rooms in acquired hotel																	417
Purchase price of acquired entity																	88,425,000
Proration and other credits																	300,000
Acquisition-related costs											1,300,000
Total cash paid for acquisitions																	29,700,000
Number of shares issued in connection with acquisition (in shares)																	5,454,164
Total equity issued directly to seller																	58,425,000
Stock consideration premium																	103.00%
Closing price of common stock on entity acquisition price determination date (in dollars per share)																		$ 10.40
Closing price of common stock on entity acquisition date (in dollars per share)																	$ 9.38
Net purchase price of acquired entity for accounting purposes																	81,160,000
Acquisitions 2012 | Hilton Garden Inn
Investment in Hotel Properties
Number of rooms in acquired hotel																			357
Purchase price of acquired entity																			90,300,000
Proration and other credits																			1,450,000
Acquisition-related costs											$ 700,000									$ 200,000