Leasing Activity (Details) $ in Thousands	Dec. 31, 2015 USD ($)
Operating Leases, Future Minimum Payments Receivable [Abstract]
2016	$ 526,956
2017	480,827
2018	415,765
2019	348,887
2020	284,738
Thereafter	1,219,397
Operating Leases, Future Minimum Payments Due	$ 3,276,570