Leases (Details 2) $ in Thousands	Dec. 31, 2016 USD ($)
As Lessor - Operating Leases
2017	$ 1,093,917
2018	888,570
2019	601,994
2020	461,278
2021	285,233
Thereafter	227,563
Total	3,558,555
As Lessor - Direct Financing and Sales-Type Leases
2017	97,877
2018	87,195
2019	71,547
2020	62,298
2021	49,515
Thereafter	82,210
Total	450,642
As Lessee - Operating Leases
2017	73,064
2018	55,481
2019	37,697
2020	20,663
2021	13,111
Thereafter	22,276
Total	$ 222,292