12. Commitments and Contingencies Commitments Letters of credit   The Company had $12.6 million of outstanding letters of credit related to normal business transactions at September 27, 2014. These agreements require the Company to maintain specified amounts of cash as collateral in segregated accounts to support the letters of credit issued thereunder, which will affect the amount of cash the Company has available for other uses. The amount of cash collateral in these segregated accounts was $14.3 million and is reflected in  Restricted cash and cash equivalents  on the Consolidated Balance Sheets. Purchase commitments   Production and purchase agreements (primarily for grass seed and grains) entered into in the ordinary course of business obligate the Company to make future purchases based on estimated yields. The terms of these contracts vary and have fixed prices or quantities. At September 27, 2014, estimated annual purchase commitments were $98.5 million for fiscal 2015, $35.0 million for fiscal 2016, $20.5 million for fiscal 2017, $13.4 million for fiscal 2018, $7.4 million for fiscal 2019 and $1.9 million thereafter. Leases   The Company has operating lease agreements principally for office and warehouse facilities and equipment. Such leases have remaining terms of 1 to 7 years. Rental expense was $21.3 million for fiscal 2014, $22.4 million for fiscal 2013 and $23.6 million for fiscal 2012. Certain facility leases have renewal options and include escalation clauses. Minimum lease payments include scheduled rent increases pursuant to these escalation provisions. Aggregate minimum annual payments on non-cancelable operating leases at September 27, 2014 are as follows: (in thousands) Fiscal year: 2015 $ 17,553 2016 14,088 2017 10,963 2018 5,458 2019 3,979 Thereafter 1,507 Total $ 53,548 Contingencies The Company may from time to time become involved in legal proceedings in the ordinary course of business. Currently, the Company is not a party to any legal proceedings the resolution of which management belie