(Level 3). Gains and losses related to the fair value changes in the deferred compensation assets and liabilities are recorded in General  and Administrative Expenses in the Consolidated Statement of Operations. The following table summarizes the fair value balances (in  thousands): We have been and may from time to time be named as a defendant in legal actions that arise in the ordinary course of business. These  include, but are not limited to, employment-related claims and contractual disputes or claims for personal injury or property damage  which occur in connection with the provision of our services and products. Management does not currently believe that any of our  pending contractual, employment-related, personal injury or property damage claims and disputes will have a material effect on our  future results of operations, financial position or cash flow. In 1998, we entered into employment agreements with our three senior executive officers that provide for severance benefits. The  present value of the long-term liability recorded and fully reserved for the benefits due upon severing the employment of these  employees is approximately $7.8 million at December 31, 2013. We do not maintain any off-balance sheet debt or other similar financing arrangements nor have we formed any special purpose  entities for the purpose of maintaining off-balance sheet debt. Scheduled minimum rental commitments under non-cancellable operating leases at December 31, 2013, consist of the following (in thousands): Operating lease commitments relate primarily to rental of equipment and office space. Rental expense for operating leases,  including amounts for short-term leases with nominal future rental commitments, was approximately $23.2 million, $21.6 million and $20.9 million for the years ended December 31, 2013, 2012 and 2011, respectively. 54 2014 $ 14,956 2015 10,096 2016 7,069 2017 5,059 2018 3,508 Thereafter 9,973 Total commitments $ 50,661 11. COMMITMENTS AND CONTINGENCIES (1)  T rust assets consist of the cash surrender value of life insurance policies and are intended to fund the deferred compensation agreements. Fair Value Measurement at December 31, 2013 Total Level 1 Level 2 Level 3 Assets: Deferred compensation trust assets  (1) $ 20,104 — $ 20,104 — Liabilities: Deferred compensation plan $ 25,470 $ 1,182 $ 24,288 — Fair Value Measurement at December 31, 2012 Total Level 1 Level 2 Level 3 Assets: Deferred compensation trust assets  (1) $ 12,654 $ — $ 12,654 $ — Liabilities: Deferred compensation plan $ 18,579 $ 2,667 $ 15,912 $   —