Summary of Significant Accounting Policies (Additional Information 1) (Details) $ in Thousands	1 Months Ended	12 Months Ended
	Oct. 31, 2019	Dec. 31, 2019 USD ($) item	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Number of Reporting Units | item		1
Assets held for sale			$ 71,800
Liabilities held for sale			24,349
Amortization of the deferred financing costs		$ 3,877	3,856	$ 3,640
Write off of deferred loan costs		1,532	605	80
Amortization of deferred leasing costs		24,200	21,300	18,500
Aggregate allowance for doubtful accounts		2,300	3,800
Deferred income		39,169	33,241	25,300
Amortization of deferred revenue		$ 15,200	12,500	10,700
Equity based compensation associated with the acceleration of equity awards			3,100
Practical Expedient, remaining term		true
Unsecured Revolving Credit Facility
Summary Of Significant Accounting Policies [Line Items]
Amortization of the deferred financing costs		$ 3,900	3,900	3,600
Write off of deferred loan costs				5,200
Term Loan Maturing 2022 Member
Summary Of Significant Accounting Policies [Line Items]
Debt Instrument Face Amount				$ 300,000
Interest rate				5.875%
Term Loan Maturing 2025
Summary Of Significant Accounting Policies [Line Items]
Debt Instrument Face Amount				$ 400,000
Interest rate				4.75%
Transaction Integration And Impairment Costs
Summary Of Significant Accounting Policies [Line Items]
Impairment losses		11,500		$ 1,600
Restructuring Charges.
Summary Of Significant Accounting Policies [Line Items]
Impairment losses			8,800
Company recorded equity-based compensation expense net of repurchased awards and forfeits		$ 16,400	15,000	$ 13,900
Cloud and managed services | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01
Summary Of Significant Accounting Policies [Line Items]
Remaining term		3 years
Assets Held For Sale
Summary Of Significant Accounting Policies [Line Items]
Assets held for sale			71,800
Rents And Other Receivables
Summary Of Significant Accounting Policies [Line Items]
Amount of the straight-line rent receivable on the balance sheets included in rents and other receivables, net		$ 38,700	29,700
Liabilities Held For Sale
Summary Of Significant Accounting Policies [Line Items]
Liabilities held for sale			$ 24,300
Unsecured Credit Facility Two | Revolving Credit Facility Maturing December 17 2023
Summary Of Significant Accounting Policies [Line Items]
Loan term	7 years