Summary of Significant Accounting Policies (Impairment to Equity-based Compensation ) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($) item	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Impairment losses	$ 0	$ 0
Number of Reporting Units | item	1
Amortization of the deferred financing costs	$ 987	978
Amortization of deferred leasing costs	6,200	5,400
Amount of the straight-line rent receivable on the balance sheets included in rents and other receivables, net	$ 42,000		$ 38,700
Practical Expedient, remaining term	true
Aggregate allowance for doubtful accounts	$ 5,200		2,300
Deferred income	39,561		$ 39,169
Amortization of deferred revenue	3,900	3,200
Company recorded equity-based compensation expense net of repurchased awards and forfeits	$ 4,900	$ 3,300
Cloud and managed services | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-04-01
Summary Of Significant Accounting Policies [Line Items]
Remaining term	3 years