Goodwill And Intangible Assets, Net | 5 . GOOD WILL AND INTANGIBLE ASSETS, NET Goodwill consisted of (in thousands): June 30, December 31, 2015 2014 Goodwill $ $ Less - accumulated amortization Less - accumulated goodwill impairment Goodwill, net $ $ Changes made to our goodwill balances during the six months ended June 30, 2015 and 2014 were as follows (in thousands): Disputes, Financial, Investigations Risk & Total & Economics Compliance Healthcare Energy Company Goodwill, net as of January 1, 2014 $ $ $ $ $ Acquisitions - - Impairment - - - Adjustments - Foreign currency - Goodwill, net as of June 30, 2014 $ $ $ $ $ Goodwill, net as of January 1, 2015 Acquisitions - - - Adjustments - Foreign currency Goodwill, net as of June 30, 2015 $ $ $ $ $ We performed our annual goodwill impairment test as of May 31, 2015 (see Note 2 – Summary of Significant Accounting Policies in our 2014 10-K). The key assumptions included: internal projections completed during our most recent quarterly forecasting process; profit margin improvement generally consistent with our longer-term historical performance; assumptions regarding contingent revenue; revenue growth rates consistent with our longer-term historical performance also considering our near term investment plans and growth objectives; discount rates that were determined based on comparable discount rates for our peer group; company specific risk considerations; and cost of capital based on our historical experience. Each reporting unit’s estimated fair value depends on various factors including its expected ability to achieve profitable growth. Based on our assumptions, at that time, the estimated fair value exceeded the net asset carrying value for each of our reporting units as of May 31, 201 5 . Accordingly, there was no indication of impairment of our goodwill for any of our reporting units. As of May 31, 2015, the estimated fair value of our Disputes, Investigations & Economics, Healthcare, Energy and Financial, Risk & Compliance reporting units exceeded their net asset carrying values by 16% , 25% , 32% and 61% , respectively. There can be no assurance that goodwill or intangible assets will not be impaired in the future. We will perform our next annual goodwill impair ment test on May 31, 2016 . In the prior year annual impairment test, the estimated fair value of our Disputes, Investigations & Economics reporting unit was less than its net asset carrying value by approximately 1% as of May 31, 2014. As such, we performed the second step of the goodwill impairment test on this reporting unit, and based on the result in May 2014 , a pre-tax goodwill impairment of $122.0 million was recorded as a separate line item within other operating costs (benefit) during the three months ended June 30, 2014 . The impairment was non-cash in nature and did not affect our liquidity, cash flows, borrowing capability or operations , nor did it impact the debt covenants under our credit agreement. For further information regarding the impairment, see Note 6 – Goodwill and Intangible Assets, Net in our 2014 10-K. As we review our portfolio of services in the future, we may exit certain markets or reposition certain service offerings within our business. Consistent with past evaluations, further evaluations may result in redefining our operating segments and may impact a significant portion of one or more of our reporting units. If such actions occur, they may be considered triggering events that would result in our performing an interim impairment test of our goodwill and an impairment test of our intangible assets. Intangible assets consisted of (in thousands): June 30, December 31, 2015 2014 Intangible assets: Customer lists and relationships $ $ Non-compete agreements Other Intangible assets, at cost Less: accumulated amortization Intangible assets, net $ $ Our intangible assets have estimated remaining useful lives ranging up to ten years which approximate the estimated periods of consumption. We will amortize the remaining net book values of intangible assets over their remaining useful lives. At June 30, 2015 , our intangible assets consisted of the following (in thousands, except year data): Weighted Average Category Remaining Years Amount Customer lists and relationships, net 7.0 $ Non-compete agreements, net 3.7 Other intangible assets, net 2.8 Total intangible assets, net 6.4 $ Total amortization expense was $ 4.6 million and $ 3.0 million for the six months ended June 30, 2015 and 201 4 , respectively. Below is the estimated annual aggregate amortization expense to be recorded in future periods related to intangible assets at June 30, 2015 (in thousands): Year Ending December 31, Amount 2015 (July-December) $ 2016 2017 2018 2019 Thereafter Total $ |