Operating Leases

12 Months Ended

Dec. 31, 2015

The Company's properties are leased to tenants under operating leases. Our leases for tenant space under 5,000 square feet generally have terms ranging from three to five years. Leases greater than 10,000 square feet generally have lease terms in excess of five years, mostly comprised of anchor tenants. Many of the anchor leases contain provisions allowing the tenant the option of extending the term of the lease at expiration. Future minimum rents under non-cancelable operating leases as of December 31, 2015, excluding both tenant reimbursements of operating expenses and additional percentage rent based on tenants' sales volume, are as follows:



In Process Year Ending December 31,	Future Minimum Rents (in thousands)
2016	$	414,025
2017	372,266
2018	323,354
2019	278,450
2020	228,796
Thereafter	1,037,783
Total	$	2,654,674

The shopping centers' tenant base primarily includes national and regional supermarkets, drug stores, discount department stores, and other retailers and, consequently, the credit risk is concentrated in the retail industry. There were no tenants that individually represented more than 5% of the Company's annualized future minimum rents.

The Company has shopping centers that are subject to non-cancelable, long-term ground leases where a third party owns and has leased the underlying land to the Company to construct and/or operate a shopping center. Ground leases expire through the year 2101, and in most cases, provide for renewal options. In addition, the Company has non-cancelable operating leases pertaining to office space from which it conducts its business. Office leases expire through the year 2027, and in most cases, provide for renewal options. Leasehold improvements are capitalized, recorded as tenant improvements, and depreciated over the shorter of the useful life of the improvements or the lease term.

Operating lease expense, including capitalized ground lease payments on properties in development, was $9.5 million, $8.9 million, and $8.5 million for the years ended December 31, 2015, 2014, and 2013, respectively. The following table summarizes the future obligations under non-cancelable operating leases as of December 31, 2015:



In Process Year Ending December 31,	Future Obligations (in thousands)
2016	$	8,450
2017	7,599
2018	7,374
2019	7,106
2020	6,393
Thereafter	253,900
Total	$	290,822