Summary of Significant Accounting Policies (Additional Information 1) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Summary of Significant Accounting Policies [Abstract]
Amortization of the deferred financing costs	$ 1,000	$ 900	$ 1,923	$ 1,815
Amortization of deferred leasing costs totaled	5,300	4,500	10,200	8,700
Deferred income	32,870		32,870		$ 25,305
Amortization of deferred revenue	3,200	2,400	6,100	5,100
Company recorded equity-based compensation expense net of repurchased awards and forfeits	4,000	$ 3,700	7,500	$ 6,800
Equity based compensation associated with the acceleration of equity awards	1,700		$ 3,100
Practical Expedient, remaining term			true
Amount of the straight-line rent receivable on the balance sheets included in rents and other receivables, net	$ 26,500		$ 26,500		$ 23,400