Comprehensive Income Revenue Recognition Pensions and Other Postretirement Benefits Foreign Currencies Non-controlling Interests Comprehensive income is comprised of net income and other charges or credits to equity that are not the result of transactions with  owners. For the years ended December 31, 2013, 2012 and 2011, other comprehensive income related to prior service costs and an  unrecognized net actuarial gain and loss from a pension plan. See Note 10 Pensions and Other Postretirement Benefit Plans. We recognize revenue when we determine that the following criteria are met: (i) persuasive evidence of an arrangement exists; (ii) delivery has occurred or services have been rendered; (iii) the fee is fixed or determinable; and (iv) collectability is reasonably assured. Services Revenue:We provide a variety of services to clients in the oil and gas industry. Where services are provided related to the  testing and analysis of rock and fluids, we recognize revenue upon the provision of the test results or analysis to the client. For our  design, field engineering and completion diagnostic services, we recognize revenue upon the delivery of those services at the well site.  In the case of our consortium studies, revenue is recognized when the reservoir model solution is presented to our clients. We conduct  testing and provide analysis services in support of our consortium studies recognizing revenue as the testing and analysis results are  made available to our consortium members. Product Sales Revenue:We manufacture equipment that we sell to our clients in the oil and gas well industry. Revenue is recognized  when title to that equipment passes to the client, which is typically when the product is shipped to the client or picked up by the client  at our facilities, as set out in the contract. All advance client payments are classified as unearned revenue until services are performed or product title is transferred. All known or  anticipated losses on contracts are provided for currently. Our functional currency is the U.S. Dollar (“USD”). All inter-company financing, transactions and cash flows of our subsidiaries are  transacted in USD. Our foreign entities remeasure monetary assets and liabilities to USD at year-end exchange rates, while  non-monetary items are measured at historical rates. Revenue and expenses are remeasured at the applicable month-end rate, except  for depreciation, amortization and certain components of cost of sales, which are measured at historical rates. For the year ended  December 31, 2013, we incurred a net remeasurement loss of approximately $4.3 million, while in the year ended December 31, 2012,  we incurred a net remeasurement loss of approximately $0.1 million, and a net remeasurement loss of approximately $1.8 million in  the year ended December 31, 2011. These amounts were included in Other (Income) Expense, net in the accompanying Consolidated  Statements of Operations. We maintain a non-contributory defined benefit pension plan for substantially all of our Dutch employees (“Dutch Plan”) who were  hired prior to 2007 based on years of service and final pay or career average pay, depending on when the employee began partic- ipating. As required by current accounting standards, we recognize net periodic pension costs associated with this plan in income  from current operations and recognize the unfunded status of the plan, if any, as a long-term liability. In addition, we recognize as a  component of other comprehensive income, the gains or losses and prior service costs or credits that arise during the period but are  not recognized as components of net periodic pension cost. The projection of benefit obligation and fair value of plan assets requires  the use of assumptions and estimates. Actual results could differ from those estimates. See Note 10 Pensions and Other Postretirement  Benefit Plans. Furthermore, we sponsor several defined contribution plans for the benefit of our employees. We expense these contribu- tions in the period the contribution is made. We maintain non-controlling interests in several investment ventures and disclose such interests clearly as a portion of equity separate  from the parent’s equity. The amount of consolidated net income attributable to these non-controlling interests must also be clearly  presented on the Consolidated Statements of Operations. In addition, when a subsidiary is deconsolidated, any retained non-controlling  equity investment in the former subsidiary will be initially measured at fair value and recorded as a gain or loss. 44