Other Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Other Assets [Abstract]
Long-term investments	$ 8,095	$ 8,140
Prepaid land rent	160,991	158,176
Straight-line rent receivable	278,670	267,682
Deferred lease costs, net	30,458	30,577
Deferred financing fees, net	3,680	3,919
Other	40,500	32,760
Total other assets	$ 522,394	$ 501,254