Summary of Significant Accounting Policies - Revenue and Deferred Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Accounting Policies [Abstract]
Deferred rent receivables	$ 71,000		$ 63,600
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Aggregate allowance for doubtful accounts	5,300	$ 5,400
Deferred income	93,495	85,400	$ 85,351
Amortization of deferred revenue	6,400	3,900
Company recorded equity-based compensation expense net of repurchased awards and forfeits	$ 6,900	$ 4,900
Cloud and managed services | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining term	3 years