Western Region Operations enrollment was approximately 2.4 million as of December 31, 2013, a decrease of 4.1 percent compared with enrollment at December 31, 2012.
Total revenues for the year ended December 31, 2013 decreased by approximately 2.1 percent to $11.1 billion from the same period in 2012.
Medicaid enrollment in California increased by 75,000 members or 7.4 percent to 1,084,000 members at December 31, 2012 compared with 1,009,000 members at December 31, 2011. The increase in the Medicaid membership included the impact of our participation in California's mandatory enrollment of SPDs into managed care programs such as ours. On November 2, 2010, CMS approved California's Section 1115 Medicaid waiver proposal, which, among other things, authorized mandatory enrollment of SPDs in managed care programs to help achieve care coordination and better manage chronic conditions. The mandatory SPD enrollment period began in June 2011 and ended on May 31, 2012. As of December 31, 2012, we had approximately 115,000 total SPD members, of which 87,000 were from the newly mandated transition of those members to managed care that began in June 2011.
The Medicare Advantage MCR in in our Western Region Operations segment was 89.3 percent for the year ended December 31, 2012 compared with 90.3 percent for the year ended December 31, 2011. The Medicare Advantage MCR improved 100 basis points for the year ended December 31, 2012 compared to the same period in 2011 primarily due to enrollment growth combined with moderate cost trends.
Our operating results for the year ended December 31, 2012 were impacted by $7.4 million in lease impairment costs related to our divested Northeast business, which were included in divested operations and services expenses. Our operating results for the year ended December 31, 2011 were impacted by a $40.8 million favorable adjustment to loss on sale of our Northeast health plan subsidiaries as a result of a purchase price adjustment.
In October 2011, we entered into a $600 million unsecured revolving credit facility due in October 2016, which includes a $400 million sublimit for the issuance of standby letters of credit and a $50 million sublimit for swing line loans (which sublimits may be increased in connection with any increase in the credit facility described below). In addition, we have the ability from time to time to increase the credit facility by up to an additional $200 million in the aggregate, subject to the receipt of additional commitments. As of December 31, 2013, $100.0 million was outstanding under our revolving credit facility and the maximum amount available for borrowing under the revolving credit facility was $492.5 million (see "-Letters of Credit" below). As of February 24, 2014, we had $100.0 million in borrowings outstanding under our revolving credit facility.
Our revolving credit facility contains customary events of default, including nonpayment of principal or other amounts when due; breach of covenants; inaccuracy of representations and warranties; cross-default and/or cross-acceleration to other indebtedness of the Company or our subsidiaries in excess of $50 million; certain ERISA-related events; noncompliance by the Company or any of our subsidiaries with any material term or provision of the HMO Regulations or Insurance Regulations (as each such term is defined in the credit facility) in a manner that could reasonably be expected to result in a material adverse effect; certain voluntary and involuntary bankruptcy events; inability to pay debts; undischarged, uninsured judgments greater than $50 million against us and/or our subsidiaries that are not stayed within 60 days; actual or asserted invalidity of any loan document; and a change of control. If an event of default occurs and is continuing under the revolving credit facility, the lenders thereunder may, among other things, terminate their obligations under the facility and require us to repay all amounts owed thereunder.
We have entered into long-term agreements to purchase various services, which may contain certain termination provisions and have remaining terms in excess of one year as of December 31, 2013.
million. The reserve developments related to prior years for the year ended December 31, 2013, when considered together with the provision for adverse deviation recorded as of December 31, 2013, did not have a material impact on our operating results or financial condition. For the year ended December 31, 2012, we had $34.5 million in unfavorable reserve developments related to prior years. We believe this unfavorable reserve development for the year ended December 31, 2012 was primarily due to significant delays in claims submissions for the fourth quarter of 2011 arising from issues related to a new billing format required by the Health Insurance Portability and Accountability Act of 1996 ("HIPAA") coupled with an unanticipated flattening of commercial trends. As part of our best estimate for IBNR, the provision for adverse deviation recorded as of December 31, 2012 was $53.4 million.
We test long-lived assets or asset groups for recoverability when events or changes in circumstances indicate that their carrying amount may not be recoverable. Circumstances which could trigger a review include, but are not limited