Future Minimum Rent

We have operating leases with tenants that expire at various dates through 2037 which generally include fixed increases or adjustments based on the consumer price index. Generally, the leases grant tenants renewal options. Leases also provide for additional rents based on certain operating expenses. Future minimum rent contractually due under operating leases, excluding tenant reimbursements of certain costs, as of December 31, 2013 for each of the next five years and thereafter is as follows (in thousands):



Year	Amount
2014	$	266,075
2015	250,484
2016	232,728
2017	208,175
2018	177,280
Thereafter	790,739
Total	$	1,925,481

A certain amount of our rental income is from tenants with leases which are subject to contingent rent provisions. These contingent rents are subject to the tenant achieving periodic revenues in excess of specified levels. For the years ended December 31, 2013, 2012 and 2011, the amount of contingent rent earned by us was not significant.