Shareholders' Equity - Additional Information (Details) - USD ($)		12 Months Ended
	Mar. 24, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Feb. 14, 2018	Jan. 01, 2013
Class Of Stock [Line Items]
Common stock, voting rights		one vote per share
Minimum % of REIT taxable income to be paid as dividend annually		90.00%				90.00%
Purchase of treasury shares		$ 9,771,000		$ 95,175,000
Preferred stock, shares authorized (in shares)		30,000,000	30,000,000
Preferred stock, shares outstanding (in shares)		0	0
Life term of contract	5 years
SACS
Class Of Stock [Line Items]
Life term of contract		25 years
Percentage of Profit Share of Parent in Joint Venture		88.75%
Percentage of Profit Share of Noncontrolling in Joint Venture		11.25%
Amended Credit Agreement
Class Of Stock [Line Items]
Maximum borrowing capacity		$ 100,000,000.0
Amended Credit Agreement | Revolving Credit Facility | Line of Credit
Class Of Stock [Line Items]
Maximum borrowing capacity					$ 900,000,000
Common Stock | February2018 Stock Buy Back Program
Class Of Stock [Line Items]
Stock repurchase program, authorized amount					$ 200,000,000
Purchase of treasury share		553,665	0	4,210,254
Purchase of treasury shares		$ 9,000,000.0	$ 0	$ 95,200,000