Summary of Significant Accounting Policies (Additional Information 1) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Summary Of Significant Accounting Policies [Line Items]
Impairment losses	$ 0	$ 0	$ 0	$ 0
Goodwill	173,843		173,843		$ 181,738
Amortization of the deferred financing costs			1,626	1,585
Amortization of deferred leasing costs totaled	3,600	2,800	7,100	5,500
Deferred income	18,306		18,306		16,991
Amortization of deferred revenue	2,300	1,400	4,200	2,700
Deferred leasing costs, net	5,483		5,483		6,263
Company recorded equity-based compensation expense net of repurchased awards and forfeits	3,200	1,800	5,300	3,100
Amount of the straight-line rent receivable on the balance sheets included in rents and other receivables, net	14,400		14,400		$ 9,100
Unsecured Revolving Credit Facility [Member]
Summary Of Significant Accounting Policies [Line Items]
Amortization of the deferred financing costs	800	800	1,600	1,600
Carpathia Hosting, Inc. [Member]
Summary Of Significant Accounting Policies [Line Items]
Goodwill	173,843	$ 173,237	173,843	$ 173,237
Senior Note [Member]
Summary Of Significant Accounting Policies [Line Items]
Deferred leasing costs, net	$ 6,600		$ 6,600