Summary of Significant Accounting Policies (Additional Information 1) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Jun. 30, 2016	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			2,424	2,372
Amortization of deferred leasing costs totaled	3,700	3,100	10,800	8,600
Deferred income	18,403		18,403			16,991
Amortization of deferred revenue	2,400	1,500	6,500	4,100
Deferred leasing costs, net	5,112		5,112			6,263
Company recorded equity-based compensation expense net of repurchased awards and forfeits	2,600	2,100	7,900	5,200
Amount of the straight-line rent receivable on the balance sheets included in rents and other receivables, net	15,900		15,900			$ 9,100
Unsecured Revolving Credit Facility [Member]
Summary Of Significant Accounting Policies [Line Items]
Amortization of the deferred financing costs	$ 800	$ 700	$ 2,400	$ 2,100
Carpathia Hosting, Inc. [Member]
Summary Of Significant Accounting Policies [Line Items]
Goodwill					$ 173,843