Note 4 - Impairment Charges	3 Months Ended
Mar. 31, 2020
Notes to Financial Statements
Asset Impairment Charges [Text Block]	4. Impairment Charges *Goodwill* We performed an interim goodwill impairment test on the March 31, 2020 balances of our Water and Mineral Services Group Materials and Specialty reporting units due to an adverse change in the business climate for these reporting units, including a modified relationship with a business partner, increased competition and market consolidation during the three months ended March 31, 2020, exasperated by economic disruption and market conditions associated with the COVID-19 pandemic. These factors led to reductions in the revenue and margin growth rates used in our quantitative goodwill tests. The goodwill impairment test resulted in a $14.8 million impairment charge during the three months ended March 31, 2020 associated with our Water and Mineral Services Group Materials reporting unit and no impairment charge associated with our Water and Minerals Services Group Specialty reporting unit as its estimated fair value exceeded its net book value (i.e., cushion) by over 15%. Interim goodwill impairment tests were not performed on our remaining reporting units as there was no indication of a possible goodwill impairment. Consistent with our annual impairment test, we calculated the estimated fair values of the Water and Mineral Services Group Materials and Water and Mineral Services Group Specialty reporting units using the discounted cash flows and market multiple methods. Judgments inherent in these methods included the determination of appropriate discount rates, the amount and timing of expected future cash flows, revenue and margin growth rates, and appropriate benchmark companies. The cash flows used in our discounted cash flow model were based on five-year financial forecasts developed internally by management adjusted for market participant-based assumptions. Our discount rate assumptions were based on an assessment of the equity cost of capital and appropriate capital structure for our reporting units. Future developments that we are unable to anticipate may require us to further revise the estimated future cash flows, which could adversely affect the fair value of our reporting units in future periods and result in additional impairment charges. The assumptions used in the goodwill impairment tests are classified as Level 3 inputs. *Subsequent Goodwill Impairment Charges* We performed a second interim goodwill impairment test on the September 30, 2020 balances of our Midwest Group Specialty, Water and Mineral Services Group Water and Water and Mineral Services Group Materials reporting units due to the continued impact from an adverse change in the business climate, including reduced market share due to loss of strategic personnel during the three months ended September 30, 2020. These factors led to reductions in the revenue and margin growth rates, and delays in the timing of future cash flows used in our quantitative goodwill tests. The goodwill impairment test resulted in a non-cash impairment charge of an additional $117.9 million and $14.4 million associated with our Water and Mineral Services Group Water and Water and Mineral Services Group Materials reporting units, respectively, during the three months ended September 30, 2020. The goodwill impairment tests for the Midwest Group Specialty reporting unit indicated that their estimated fair values exceeded their net book value (i.e., headroom) by nearly 15%; therefore, no impairment charge was recorded. Interim goodwill impairment tests were not performed on our remaining reporting units as there was no indication of a possible goodwill impairment. We completed our 2020 annual goodwill impairment tests during the quarter ended December 31, 2020 and no additional impairment charge was recorded. *Investment in Affiliates* During the three months ended March 31, 2020, operating costs increased in certain of our foreign entity investments in affiliates which resulted in price increases and therefore a decrease in demand. The effect of this change in business climate on certain investments’ expected future operating cash flows resulted in other than temporary decline in fair value below the carrying value. Therefore, we recorded a non-cash impairment charge of $9.6 million during the three months ended March 31, 2020. The remaining carrying value of the investments of $73.2 million at March 31, 2020 represents the fair value recorded on a nonrecurring basis and is a Level 3 fair value measurement.

Note 4 - Impairment Charges

3 Months Ended

Mar. 31, 2020

4. Impairment Charges

Goodwill

We performed an interim goodwill impairment test on the March 31, 2020 balances of our Water and Mineral Services Group Materials and Specialty reporting units due to an adverse change in the business climate for these reporting units, including a modified relationship with a business partner, increased competition and market consolidation during the three months ended March 31, 2020, exasperated by economic disruption and market conditions associated with the COVID-19 pandemic. These factors led to reductions in the revenue and margin growth rates used in our quantitative goodwill tests. The goodwill impairment test resulted in a $14.8 million impairment charge during the three months ended March 31, 2020 associated with our Water and Mineral Services Group Materials reporting unit and no impairment charge associated with our Water and Minerals Services Group Specialty reporting unit as its estimated fair value exceeded its net book value (i.e., cushion) by over 15%. Interim goodwill impairment tests were not performed on our remaining reporting units as there was no indication of a possible goodwill impairment.

Consistent with our annual impairment test, we calculated the estimated fair values of the Water and Mineral Services Group Materials and Water and Mineral Services Group Specialty reporting units using the discounted cash flows and market multiple methods. Judgments inherent in these methods included the determination of appropriate discount rates, the amount and timing of expected future cash flows, revenue and margin growth rates, and appropriate benchmark companies. The cash flows used in our discounted cash flow model were based on five-year financial forecasts developed internally by management adjusted for market participant-based assumptions. Our discount rate assumptions were based on an assessment of the equity cost of capital and appropriate capital structure for our reporting units.

Future developments that we are unable to anticipate may require us to further revise the estimated future cash flows, which could adversely affect the fair value of our reporting units in future periods and result in additional impairment charges. The assumptions used in the goodwill impairment tests are classified as Level 3 inputs.

Subsequent Goodwill Impairment Charges

We performed a second interim goodwill impairment test on the September 30, 2020 balances of our Midwest Group Specialty, Water and Mineral Services Group Water and Water and Mineral Services Group Materials reporting units due to the continued impact from an adverse change in the business climate, including reduced market share due to loss of strategic personnel during the three months ended September 30, 2020. These factors led to reductions in the revenue and margin growth rates, and delays in the timing of future cash flows used in our quantitative goodwill tests. The goodwill impairment test resulted in a non-cash impairment charge of an additional $117.9 million and $14.4 million associated with our Water and Mineral Services Group Water and Water and Mineral Services Group Materials reporting units, respectively, during the three months ended September 30, 2020. The goodwill impairment tests for the Midwest Group Specialty reporting unit indicated that their estimated fair values exceeded their net book value (i.e., headroom) by nearly 15%; therefore, no impairment charge was recorded. Interim goodwill impairment tests were not performed on our remaining reporting units as there was no indication of a possible goodwill impairment. We completed our 2020 annual goodwill impairment tests during the quarter ended December 31, 2020 and no additional impairment charge was recorded.

Investment in Affiliates

During the three months ended March 31, 2020, operating costs increased in certain of our foreign entity investments in affiliates which resulted in price increases and therefore a decrease in demand. The effect of this change in business climate on certain investments’ expected future operating cash flows resulted in other than temporary decline in fair value below the carrying value. Therefore, we recorded a non-cash impairment charge of $9.6 million during the three months ended March 31, 2020. The remaining carrying value of the investments of $73.2 million at March 31, 2020 represents the fair value recorded on a nonrecurring basis and is a Level 3 fair value measurement.