Other Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Other Assets [Abstract]
Long-term investments	$ 8,055	$ 8,140
Prepaid land rent	179,791	158,176
Straight-line rent receivable	290,508	267,682
Deferred lease costs, net	30,719	30,577
Deferred financing fees, net	3,444	3,919
Other	38,434	32,760
Total other assets	$ 550,951	$ 501,254