7. COMMITMENTS AND CONTINGENCIES We lease certain office space and office equipment under operating leases. Some of our operating leases include rent escalations, rent holidays, and rent concessions and incentives. However, we recognize lease expense on a straight-line basis over the related minimum lease term utilizing total future minimum lease payments. Future minimum rental payments under operating leases with initial or remaining non-cancelable lease terms of one year or more as of December 31, 2013 are as follows: Operating Lease 2014 $ 11,780 2015 10,461 2016 7,244 2017 7,035 2018 6,119 Thereafter 44,996 $ 87,635 Rent expense for the years ended December 31, 2013, 2012 and 2011, was approximately $16,635, $11,060 and $18,145, respectively. Rent expense for the years ended December 31, 2013 and 2011 included approximately $5,341 and $6,440, respectively, of lease termination fees related to the exit of certain facility leases. These lease termination fees are included in the restructuring, acquisition and integration-related expenses line item of the accompanying consolidated statements of operations. Performance Targets In the ordinary course of contracting with our clients, we may agree to make some or all of our fees contingent upon the client s achievement of financial improvement targets from the use of our services and software. These contingent fees are not recognized as revenue until the client confirms achievement of the performance targets. We generally receive client acceptance as and when the performance targets are achieved. Prior to client confirmation that a performance target has been achieved, we record invoiced contingent fees as deferred revenue on our consolidated balance sheet. Often, recognition of this revenue occurs in periods subsequent to the recognition of the associated costs. Legal Proceedings As of December 31, 2013, we are not presently involved in any legal proceedings, the outcome of which, if determined adversely to us, would have a material adverse effect on our business,