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Operating Leases
12 Months Ended
Dec. 31, 2017
Leases, Operating [Abstract]  
Operating Leases
16. OPERATING LEASES

The terms and expirations of our operating leases with our tenants vary. The lease agreements frequently contain options to extend the terms of leases and other terms and conditions as negotiated. We retain substantially all of the risks and benefits of ownership of the real estate assets leased to tenants.
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


No single tenant comprised 10% or more of our aggregate annualized base rent as of December 31, 2017. As of December 31, 2017, our real estate investments in Florida represented 12.8% of our ABR. As a result, the geographic concentration of our portfolio makes it particularly susceptible to adverse economic or weather developments in the Florida real estate market.