Summary of Significant Accounting Policies (Additional Information 1) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Summary of Significant Accounting Policies [Abstract]
Assets held for sale			$ 71,800
Liabilities held for sale			24,349
Amortization of the deferred financing costs	$ 978	$ 962
Amortization of deferred leasing costs totaled	5,400	4,900
Deferred income	38,167		33,241
Amortization of deferred revenue	3,200	2,900
Company recorded equity-based compensation expense net of repurchased awards and forfeits	$ 3,300	3,500
Equity based compensation associated with the acceleration of equity awards		$ 1,400
Practical Expedient, remaining term	true
Amount of the straight-line rent receivable on the balance sheets included in rents and other receivables, net	$ 31,400		$ 29,700