the entire penalty amount within 120 days, plus prejudgment interest at the statutory rate of 7%. On January 12, 2017, the California DOI filed a notice of appeal of the Superior Court's judgment. While the appeal was pending, the California DOI returned the entire penalty amount plus accrued interest, a total of $30.9 million, to the Company in June 2017 in order to avoid accruing further interest. Because the matter had not been settled or otherwise finally resolved at the time, the Company did not recognize the $30.9 million as a gain in the consolidated statements of operations; instead, it recorded the $30.9 million plus interest earned in other liabilities in the consolidated balance sheets. The Company had filed a motion to dismiss the false advertising portion of the case based on the Superior Court's findings, but the ALJ denied that motion after the appeal was filed. The ALJ did, however, grant the Company's alternative request to stay further proceedings pending the final determination of the appeal. On May 7, 2019, the California Court of Appeal issued its decision reversing the Superior Court’s original judgment and directing the Superior Court to enter a new judgment in favor of the California DOI. The Company filed a petition for rehearing, which was denied, and subsequently filed a petition for review in the Supreme Court of California. Based on the decision of the California Court of Appeal, the Company accrued approximately $3 million in the second quarter of 2019, which represented an estimated amount of statutory interest the Company might be ordered to pay beyond the actual interest it had earned on the $30.9 million. The California Supreme Court denied the Company's petition for review on August 14, 2019, and the Commissioner's Order became final. On August 30, 2019, the Company paid approximately $35 million to the California DOI, which consisted of the $30.9 million received from the California DOI in June 2017 plus statutory interest.
The Company establishes reserves for non-insurance claims related lawsuits, regulatory actions, and other contingencies when the Company believes a loss is probable and is able to estimate its potential exposure. For material loss contingencies believed to be reasonably possible, the Company also discloses the nature of the loss contingency and an estimate of the possible loss, range of loss, or a statement that such an estimate cannot be made. While actual losses may differ from the amounts recorded and the ultimate outcome of the Company’s pending actions is generally not yet determinable, the Company does not believe that the ultimate resolution of currently pending legal or regulatory proceedings, either individually or in the aggregate, will have a material adverse effect on its financial condition or cash flows.
American Mercury Lloyds Insurance Company is not owned but is controlled by the Company through its attorney-in-fact, Mercury Select Management Company, Inc.
The Company accounts for all derivative instruments, other than those that meet the normal purchases and sales exception, as either an asset or liability, measured at fair value, which is based on information obtained from independent parties. In addition, changes in fair value are recognized in earnings unless specific hedge accounting criteria are met. The Company’s derivative instruments include total return swaps and options sold. See Note 9. Derivative Financial Instruments.
In January 2017, the FASB issued ASU 2017-04, "Intangibles - Goodwill and Other (Topic 350), Simplifying the Test for Goodwill Impairment." ASU 2017-04 removes the requirement to compare the implied fair value of goodwill with its carrying amount as part of Step 2 of the goodwill impairment test and requires an entity to recognize an impairment charge for the amount by which the carrying amount of a reporting unit exceeds its fair value. An entity still has the option to perform the qualitative assessment for a reporting unit to determine if the quantitative impairment test is necessary. ASU 2017-04 became effective for the Company on January 1, 2020 and did not have any material impact on its consolidated financial statements and related disclosures.
The Company obtained unadjusted fair values on 97.9% of its investment portfolio from an independent pricing service. For a private equity fund that was classified as Level 3 and included in equity securities at December 31, 2019 and 2018, the Company obtained specific unadjusted broker quotes based on net fund value and, to a lesser extent, unobservable inputs from at least one knowledgeable outside security broker to determine the fair value. The fair value of the private equity fund was $1.2 million and $1.4 million at December 31, 2019 and 2018, respectively.
Depreciation expense, including amortization of leasehold improvements, was $23.2 million, $19.9 million, and $21.2 million for 2019, 2018, and 2017, respectively.
On March 29, 2017, the Company entered into an unsecured credit agreement that provides for revolving loans of up to $50 million and matures on March 29, 2022. The interest rates on borrowings under the credit facility are based on the Company's debt to total capital ratio and range from LIBOR plus 112.5 basis points when the ratio is under 15% to LIBOR plus 162.5 basis points when the ratio is greater than or equal to 25%. Commitment fees for the undrawn portions of the credit facility range from 12.5 basis points when the ratio is under 15% to 22.5 basis points when the ratio is greater than or equal to 25%. The debt to total capital ratio is expressed as a percentage of (a) consolidated debt to (b) consolidated shareholders' equity plus consolidated debt. The Company's debt to total capital ratio was 17.2% at December 31, 2019, resulting in a 15 basis point commitment fee on the $50 million undrawn portion of the credit facility. As of February 6, 2020, there have been no borrowings under this facility.
The increase in the provision for insured events of prior years in 2019 of approximately $9.8 million primarily resulted from higher than estimated defense and cost containment expenses in the California automobile line of insurance business, partially offset by favorable development on prior years’ loss and loss adjustment expense reserves, including catastrophe losses, in certain of the Company's other lines of insurance business.
The CEA is a quasi-governmental organization that was established to provide a market for earthquake coverage to California homeowners. The Company places all new and renewal earthquake coverage offered with its homeowners policies directly with the CEA. The Company receives a small fee for placing business with the CEA, which is recorded as other income in the consolidated statements of operations. Upon the occurrence of a major seismic event, the CEA has the ability to assess participating companies for losses. These assessments are made after CEA capital has been expended and are based upon each company’s participation percentage multiplied by the amount of the total assessment. Based upon the most recent information provided by the CEA, the Company’s maximum total exposure to CEA assessments at April 3, 2019, the most recent date at which information was available, was approximately $73.8 million. There was no assessment made in 2019.