Stockholders' Equity - Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Thousands			1 Months Ended				3 Months Ended	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2021	May 31, 2021	Apr. 30, 2021	May 31, 2016	Jun. 30, 2021	Jun. 30, 2021
Stockholders' equity
Preferred stock redemption charge								$ 4,016
Series E Cumulative Redeemable Preferred Stock
Stockholders' equity
Number of shares redeemed (in shares)			4,600,000
Preferred stock, Cumulative Redeemable Preferred Stock, dividend rate (as a percent)		6.95%	6.95%
Redemption price (in dollars per share)	$ 25.00		$ 25.00				$ 25.00	$ 25.00
Preferred stock redemption charge			$ 4,000
Preferred stock, Cumulative Redeemable Preferred Stock, shares outstanding (in shares)	0	4,600,000	0				0	0
Liquidation preference (in dollars per share)		$ 25.00
Series F Cumulative Redeemable Preferred Stock
Stockholders' equity
Preferred stock, Cumulative Redeemable Preferred Stock, dividend rate (as a percent)	6.45%	6.45%				6.45%
Redemption price (in dollars per share)				$ 25.00
Preferred stock, Cumulative Redeemable Preferred Stock, shares outstanding (in shares)	3,000,000	3,000,000	3,000,000				3,000,000	3,000,000
Number of shares of preferred stock issued (in shares)						3,000,000
Liquidation preference (in dollars per share)	$ 25.00	$ 25.00	$ 25.00			$ 25.00	$ 25.00	$ 25.00
Series G Cumulative Redeemable Preferred Stock
Stockholders' equity
Preferred stock, Cumulative Redeemable Preferred Stock, shares outstanding (in shares)	2,650,000	0	2,650,000				2,650,000	2,650,000
Liquidation preference (in dollars per share)	$ 25.00		$ 25.00				$ 25.00	$ 25.00
Series G Cumulative Redeemable Preferred Stock | Montage Healdsburg
Stockholders' equity
Number of shares of preferred stock issued (in shares)					2,650,000
Liquidation preference (in dollars per share)					$ 25.00
Series H Cumulative Redeemable Preferred Stock
Stockholders' equity
Preferred stock, Cumulative Redeemable Preferred Stock, dividend rate (as a percent)	6.125%			6.125%
Redemption price (in dollars per share)				$ 25.00
Preferred stock, Cumulative Redeemable Preferred Stock, shares outstanding (in shares)	4,600,000	0	4,600,000				4,600,000	4,600,000
Number of shares of preferred stock issued (in shares)				4,600,000
Liquidation preference (in dollars per share)	$ 25.00		$ 25.00	$ 25.00			$ 25.00	$ 25.00
Preferred stock redemption date				May 24, 2026
Preferred Stock | Series E Cumulative Redeemable Preferred Stock
Stockholders' equity
Number of shares redeemed (in shares)							(4,600,000)
Preferred Stock | Series H Cumulative Redeemable Preferred Stock
Stockholders' equity
Number of shares of preferred stock issued (in shares)							4,600,000