Total revenues increased 19% in the year ended December 31, 2017, over the corresponding period in 2016, primarily as a result of a full year of Health Net's results, as well as the impact of growth in the Health Insurance Marketplace business in 2017 and expansions and new programs in many of our states in 2016 and 2017. This was partially offset by the moratorium of the health insurer fee in 2017, lower membership in the commercial business in California as a result of margin improvement actions taken in 2016, and lower specialty pharmacy revenues. As a result of the health insurer fee moratorium, which suspended the health insurance provider fee for the 2017 calendar year, we did not recognize health insurer fee revenue in 2017, compared to $531 million recognized in 2016. During the year ended December 31, 2017, we received Medicaid premium rate adjustments which yielded an approximate net 1% composite change across all of our markets.
Appropriate leveling of care for neonatal intensive care unit hospital admissions, other inpatient hospital admissions, and observation admissions, in accordance with Interqual or other criteria.
The Company tests goodwill for impairment using a fair value approach. The Company is required to test for impairment at least annually, absent a triggering event, which could include a significant decline in operating performance that would require an impairment assessment. Absent any impairment indicators, the Company performs its goodwill impairment testing during the fourth quarter of each year. The Company recognizes an impairment charge for any amount by which the carrying amount of goodwill exceeds its implied fair value.
The Company's contracts with states may require us to maintain a minimum health benefits ratio (HBR) or may require us to share profits in excess of certain levels. In certain circumstances, our plans may be required to return premium to the state in the event profits exceed established levels. We estimate the effect of these programs and recognize reductions in revenue in the current period. Other states may require us to meet certain performance and quality metrics in order to receive additional or full contractual revenue. For performance-based contracts, we do not recognize revenue subject to refund until data is sufficient to measure performance.
The ACA directs issuers to reduce the Company's members' cost sharing for essential health benefits for individuals with Federal Poverty Levels (FPLs) between 100% and 250% who are enrolled in a silver tier product; eliminate cost sharing for Indians/Alaska Natives with an FPL less than 300% and eliminate cost sharing for Indians/Alaska Natives regardless of FPL level when services are provided by an Indian Health Service. In order to compensate issuers for reduced cost sharing provided to enrollees, CMS pays an advance CSR payment to the Company each month based on the Company’s certification data provided at the time of the qualified health plan application. After the close of the benefit year, the Company is required to provide CMS with data on the value of the CSRs provided to enrollees based on either a ‘simplified’ or ‘standard’ approach. A reconciliation will occur in order to calculate the difference between the Company’s CSR advance payments received and the value of CSRs provided to enrollees. This reconciliation will produce either a payable or receivable to/from CMS. The Company has elected the standard methodology approach. In October 2017, the Trump Administration issued an executive order that immediately ceased payments of CSRs to issuers.
Other income (expense) consists principally of investment income, interest expense and equity method earnings from investments. Investment income is derived from the Company's cash, cash equivalents, restricted deposits and investments. Interest expense relates to borrowings under the senior notes, interest rate swaps, credit facilities, interest on capital leases and credit facility fees.
The acquisition resulted in $3,859 million of goodwill related primarily to buyer specific synergies expected from the acquisition and the assembled workforce of Health Net. This goodwill is not deductible for income tax purposes. The Company assigned $3,643 million of goodwill to the Managed Care segment and $216 million of goodwill to the Specialty Services segment.
additional stock compensation expense related to the amortization of the fair value increase to Health Net rollover stock awards.
Health Net. On March 24, 2016, the Company acquired all of the issued and outstanding shares of Health Net, a publicly traded managed care organization that delivers healthcare services through health plans and government-sponsored managed care plans. See Note 3, Health Net, for further discussion.
During 2017, the Company recognized a $48 million net pre-tax benefit related to the reconciliation of the 2016 risk adjustment program, compared to a $51 million net pre-tax benefit in 2016 related to the reconciliation of the 2015 risk adjustment and reinsurance programs.
In connection with the February 2016 issuance, the Company entered into interest rate swap agreements for notional amounts of $600 million and $1,000 million, at floating rates of interest based on the three month LIBOR plus 4.22% and the three month LIBOR plus 4.44%, respectively. Gains and losses due to changes in the fair value of the interest rate swaps completely offset changes in the fair value of the hedged portion of the underlying debt and are recorded as an adjustment to the $1,400 Million Notes and $1,000 Million Notes.
In October 2017, the Company executed a $200 million non-recourse construction loan to fund the expansion of the Company's corporate headquarters. The loan bears interest based on the one month LIBOR plus 2.70% and matures in April 2021 with an optional one-year extension. The agreement contains financial and non-financial covenants aligning with the Company's revolving credit agreement. The Company has guaranteed completion of the construction project associated with the loan. As of December 31, 2017, the Company had no borrowings outstanding under the loan.
Option activity for the year ended December 31, 2017 is summarized below (shares in thousands):
Additionally, in January 2018, a separate derivative action was filed on behalf of Centene Corporation against the Company and certain of its officers and directors in the United States District Court for the Eastern District of Missouri. Plaintiff purports to bring suit derivatively on behalf of the Company against certain officers and directors for violation of securities laws, breach of fiduciary duty, waste of corporate assets and unjust enrichment. The derivative complaint repeats many of the allegations in the federal securities class action described above and asserts that defendants made inaccurate or misleading statements, and/or failed to correct the alleged misstatements.