pre_text: Deferred Compensation Plan The Company has a non-qualified, unfunded deferred compensation plan, which provides certain key employees, including executive officers, with the ability to defer the receipt of compensation in order to accumulate funds for retirement on a tax deferred basis. The Company does not make contributions to the plan or guarantee returns on the investments. The Company is responsible for the plan’s administrative expenses. Participants’ deferrals and investment gains and losses remain as the Company’s liabilities and the underlying assets are subject to claims of general creditors. The liabilities for compensation deferred under the plan are recorded at fair value in each reporting period. Changes in the fair value of the liabilities are included in operating expense on the Consolidated Statements of Operations. The Company manages the risk of changes in the fair value of the liabilities by electing to match the liabilities with investments in corporate-owned life insurance policies, mutual funds and money market funds that offset a substantial portion of the exposure. The investments are recorded at the cash surrender value of the corporate-owned life insurance policies, and at the fair value of the mutual funds and money market funds, which are classified as trading securities. Changes in the cash surrender value of the corporate-owned life insurance policies and the fair value of mutual fund and money market fund investments are included in interest and other income, net on the Consolidated Statements of Operations. The following table summarizes the deferred compensation plan balances on the Consolidated Balance Sheets (in thousands):
table: December 31,
table: 2019 2018
table: Deferred compensation plan asset components:
table: Cash surrender value of corporate-owned life insurance policies $16,883 $13,103
table: Fair value of mutual funds and money market funds 21,975 18,867
table: Total $38,858 $31,970
table: Deferred compensation plan assets reported in:
table: Other long-term assets $38,858 $31,970
table: Deferred compensation plan liabilities reported in:
table: Accrued compensation and related benefits (short-term) $425 $447
table: Other long-term liabilities 39,665 32,283
table: Total $40,090 $32,730
question: Analyse this data from a financial earnings document. What was the change in Cash surrender value of corporate-owned life insurance policies from 2018 to 2019?