Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended					3 Months Ended	12 Months Ended
	Jul. 31, 2014	Jun. 30, 2014	Nov. 30, 2013	Mar. 31, 2013	Feb. 28, 2013	Mar. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Feb. 28, 2014
Stockholders' equity
Net proceeds from issuance of common stock								$ 283,456	$ 565,760
Proceeds from stock issuance used to redeem Series A preferred stock and Series C preferred stock				$ 279,700
Series A Cumulative Redeemable Preferred Stock
Stockholders' equity
Number of shares redeemed (in shares)				7,050,000
Amount paid to redeem Series A preferred stock				$ 178,600		$ 178,600
Accrued dividends paid on redemption				2,300
Additional redemption charges				$ 4,600
Preferred stock, outstanding shares (in shares)				0		0
Preferred stock, 8.0% Cumulative Redeemable Preferred Stock, dividend rate (as a percent)						8.00%
Series D Cumulative Redeemable Preferred Stock
Stockholders' equity
Preferred stock, outstanding shares (in shares)							4,600,000	4,600,000
Number of shares of stock issued (in shares)							4,600,000	4,600,000
Preferred stock, 8.0% Cumulative Redeemable Preferred Stock, dividend rate (as a percent)							8.00%	8.00%
Liquidation preference (in dollars per share)							$ 25.00	$ 25.00
Future redemption price (in dollars per share)							$ 25.00	$ 25.00
Common Stock
Stockholders' equity
Net proceeds from issuance of common stock		$ 262,500	$ 270,900		$ 294,900
Number of shares issued (in shares)		18,000,000	20,000,000		25,300,000
Number of shares of the underwriters' over-allotment issued (in shares)					3,300,000
Common Stock | At The Market
Stockholders' equity
Stock issuance program, remaining amount							$ 128,400
Net proceeds from issuance of common stock								$ 21,000
Number of shares issued (in shares)								1,352,703
Common Stock | Maximum | At The Market
Stockholders' equity
Stock issuance program, authorized amount										$ 150,000
Wailea Beach Marriott Resort & Spa | Common Stock
Stockholders' equity
Number of shares issued in connection with acquisition (in shares)	4,034,970
Total equity issued directly to seller	$ 60,000