Operating Leases

Most of the Company’s rental properties are leased under operating leases with expiration dates ranging from 1 to 32 years. Future minimum rentals on non-cancelable tenant operating leases at December 31, 2017 are as follows (in thousands):



	Amount
Year:
2018	$	474,608
2019	459,318
2020	446,051
2021	437,723
2022	422,306
Thereafter	3,656,516
Total (1)	$	5,896,522

(1) Future minimum rentals excludes rental revenue from properties leased to CLA. Certain subsidiaries of CLA that are the Company's tenants have filed Chapter 11 petitions in bankruptcy seeking protections of the Bankruptcy Code. Due to the uncertain outcome of these petitions, the rental revenue related to these properties have been excluded from the table above.

The Company leases its executive office from an unrelated landlord. Rental expense totaled approximately $1.0 million, $681 thousand and $556 thousand for the years ended December 31, 2017, 2016 and 2015, respectively, and is included as a component of general and administrative expense in the accompanying consolidated statements of income. Future minimum lease payments under this lease at December 31, 2017 are as follows (in thousands):



	Amount
Year:
2018	$	856
2019	856
2020	856
2021	884
2022	967
Thereafter	3,625
Total	$	8,044