Future Minimum Rents (Tables)

12 Months Ended

Dec. 31, 2017

Future Minimum Rents [Abstract]

Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]

The future contractual minimum lease payments to be received (excluding operating expense reimbursements) by the Company as of December 31, 2017, under non-cancelable operating leases which expire on various dates through 2046, are as follows: 

Years Ending December 31,	(in thousands)
2018	$	1,962,841
2019	1,998,102
2020	1,920,002
2021	1,783,066
2022	1,596,719
Thereafter	11,160,780