Other Assets - Additional Information (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Other Assets, Unclassified [Abstract]
Straight line rent receivable	$ 47,599	$ 32,018
Prepaid expenses	18,103	8,928
Interest rate swap	14,693	13,881
Lease inducements, net	14,232	13,255
Leasing commissions, net	4,128	1,858
Earnest deposits	2,780	1,500
Escrows	1,996	4,334
Notes receivable	0	16,618
Other	2,771	2,795
Total other assets	$ 106,302	$ 95,187