Summary of Significant Accounting Policies (Additional Information 1) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Summary Of Significant Accounting Policies [Line Items]
Impairment losses	$ 0	$ 0
Goodwill	173,843		$ 173,843
Amortization of the deferred financing costs	872	813
Amortization of deferred leasing costs totaled	4,200	3,500
Deferred income	23,784		21,993
Amortization of deferred revenue	2,600	1,900
Company recorded equity-based compensation expense net of repurchased awards and forfeits	3,100	2,100
Amount of the straight-line rent receivable on the balance sheets included in rents and other receivables, net	18,800		$ 17,300
Unsecured Revolving Credit Facility [Member]
Summary Of Significant Accounting Policies [Line Items]
Amortization of the deferred financing costs	$ 900	$ 800