Leases (Details 2) $ in Thousands	Dec. 31, 2015 USD ($)
As Lessor - Operating Leases
2016	$ 1,049,766
2017	857,397
2018	678,150
2019	481,790
2020	298,659
Thereafter	241,589
Total	3,607,351
As Lessor - Direct Financing Leases
2016	111,116
2017	93,215
2018	76,073
2019	60,062
2020	50,402
Thereafter	87,867
Total	478,735
As Lessee - Operating Leases
2016	74,103
2017	39,265
2018	21,675
2019	14,066
2020	6,896
Thereafter	17,420
Total	$ 173,425