Summary of Significant Accounting Policies (Additional Information 1) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Jun. 30, 2015	Dec. 31, 2014
Summary Of Significant Accounting Policies [Line Items]
Impairment losses	$ 0	$ 0
Goodwill	171,679		$ 181,738	$ 173,237
Amortization of the deferred financing costs	813	791
Amortization of deferred leasing costs totaled	3,500	2,700
Deferred income	16,435		16,991
Amortization of deferred revenue	1,900	1,200
Deferred leasing costs, net	5,873		6,263
Company recorded equity-based compensation expense net of repurchased awards and forfeits	2,100	1,300
Amount of the straight-line rent receivable on the balance sheets included in rents and other receivables, net	11,000		$ 9,100
Unsecured Revolving Credit Facility [Member]
Summary Of Significant Accounting Policies [Line Items]
Amortization of the deferred financing costs	800	$ 800
Carpathia Hosting, Inc. [Member]
Summary Of Significant Accounting Policies [Line Items]
Goodwill	171,679
Princeton Facility [Member]
Summary Of Significant Accounting Policies [Line Items]
Deferred leasing costs, net					$ 2,700
Senior Note [Member]
Summary Of Significant Accounting Policies [Line Items]
Deferred leasing costs, net	$ 6,800