6 . Commitments and Contingencies Leases We lease office buildings and miscellaneous equipment under leasing agreements. The majority of our leases are operating leases. In addition to rent, certain of our leases require us to pay property taxes, insurance, maintenance, and other operating expenses of our facilities. Future minimum lease payments required under our capital leases and non-cancellable operating leases as of December 31, 2013 are as follows: Capital Operating 2014 $ 18 $ 751 2015 13 398 2016 - 393 2017 - 331 2018 - 297 Thereafter - 281 Total future minimum lease payments 31 $ 2,451 Less amounts representing interest 2 Present value of net minimum lease payments 29 Less: current portion of capital lease obligations 17 Total $ 12 Rental cost was approximately $ 641,000 , $ 392,000 and $ 405,000 , for the years ended December 31, 2013, 2012 and 2011, respectively. Litigation We are involved in various legal and regulatory proceedings that arise in the ordinary course of business. We record accruals for such contingencies to the extent that we conclude that their occurrence is both probable and estimable. We have estimated the likelihood of unfavorable outcomes and the amounts of such potential losses. In our opinion, the ultimate outcome of these proceedings and claims is not anticipated to have a material adverse effect on our consolidated financial position, results of operations, or cash flows. However, the ultimate outcome of litigation is unpredictable and actual results could be materially different from our estimates. We record anticipated recoveries under applicable insurance contracts when we are assured of recovery. In October 2011, we received a subpoena issued by the Office of Inspector General (the   OIG ), under the authority of the federal healthcare fraud and false claims laws. The subpoena sought documents for the period January 1, 2008 through October 6, 2011. We cooperated with the government s request and entered into a settlement agreement in June 2013, admitting no wrongdoing as p