Shareholders' Equity - Narrative (Details)							1 Months Ended			12 Months Ended
	Oct. 20, 2020 USD ($) $ / shares	Sep. 16, 2020 $ / shares	Mar. 10, 2020 USD ($)	Oct. 23, 2019 USD ($) $ / shares	Sep. 24, 2019 $ / shares	Mar. 13, 2019 USD ($)	Feb. 28, 2021 USD ($)	Mar. 31, 2020 USD ($)	Feb. 29, 2020 USD ($)	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) shares	Dec. 14, 2021 USD ($)	Mar. 01, 2021 USD ($)	Oct. 08, 2019	Oct. 07, 2019
Class of Stock [Line Items]
Repurchase of shares | $										$ 174,407,000	$ 20,869,000
Distributions declared per common share (in dollars per share) | $ / shares		$ 3.50			$ 3.50
Distributions paid per common share (in dollars per share) | $ / shares	$ 3.50			$ 3.50
Cash distributions paid | $	$ 426,700,000			$ 427,700,000			$ 6,000,000		$ 2,900,000	$ 6,024,000	$ 427,795,000	$ 428,649,000
Preferred shares, of beneficial interest, shares outstanding (in shares)										4,915,196	4,915,196
Preferred shares, dividend yield										6.50%	6.50%
Common Shares
Class of Stock [Line Items]
Stock repurchase program, authorized amount (up to) | $			$ 150,000,000			$ 150,000,000							$ 150,000,000	$ 150,000,000
Stock repurchase program, period in force			12 months			12 months
Stock repurchase program, amount not utilized | $								$ 129,200,000
Repurchase of shares (in shares)										6,735,810	711,000
Average cost per share (in dollars per share) | $ / shares										$ 25.85	$ 29.31
Repurchase of shares | $										$ 174,100,000	$ 20,800,000
Number of shares repurchased (in shares)												0
Stock repurchase program, remaining authorized repurchase amount | $										$ 125,900,000
Surrender of shares for tax withholding (in shares)										245,560	184,068	168,327
Common shares from conversion of preferred shares (in shares)										3,236,657
Series D Preferred Stock
Class of Stock [Line Items]
Preferred shares dividend (in dollars per share) | $ / shares										$ 1.625
Preferred shares, dividend yield										6.50%	6.50%	6.50%
Initial conversion rate										0.6585					0.5813	0.5215
Initial conversion price per share (in dollars per share) | $ / shares										$ 37.97
Additional common shares (in shares)										3,236,657
Liquidation preference (in dollars per share) | $ / shares										$ 25.00
Percentage of average closing market price of the entity's common stock based on which ratio for conversion of preferred shares into common shares is determined										98.00%
Purchase price as a percentage of liquidation preference										100.00%
Common shares from conversion of preferred shares (in shares)										4,915,196