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Operating Leases (Tables)
12 Months Ended
Dec. 31, 2017
Leases, Operating [Abstract]  
Schedule of Future Minimum Rental Payments for Operating Leases
Approximate future rental income to be received under noncancelable operating leases in effect as of December 31, 2017, assuming no new or renegotiated leases or option extensions on lease agreements, is as follows (in thousands):
Year
Amount
2018
$
270,880

2019
242,613

2020
212,708

2021
178,096

2022
145,745

2023 and thereafter
429,545

Total
$
1,479,587