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Commitments and Contingencies	6 Months Ended
Commitments and Contingencies	Jun. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Environmental Liabilities Liabilities recognized for estimated environmental costs were $24.0 million and $18.9 million at December 31, 2016 and June 30, 2017, respectively. We have classified environmental liabilities as current or noncurrent based on management’s estimates regarding the timing of actual payments. Environmental expenses recognized as a result of changes in our environmental liabilities are generally included in operating expenses on our consolidated statements of income. Environmental expenses were $0.8 million and $0.2 million for the three months ended June 30, 2016 and 2017, respectively, and $4.3 million and $4.5 million for the six months ended June 30, 2016 and 2017, respectively. Environmental Receivables Receivables from insurance carriers and other third parties related to environmental matters were $4.1 million at December 31, 2016, of which $0.6 million and $3.5 million were recorded to other accounts receivable and long-term receivables, respectively, on our consolidated balance sheets. Receivables from insurance carriers and other third parties related to environmental matters were $3.9 million at June 30, 2017, of which $0.5 million and $3.4 million were recorded to other accounts receivable and long-term receivables, respectively, on our consolidated balance sheets. Other See Note 4 – Investments in Non-Controlled Entities for detail of our guarantee on behalf of Powder Springs. We are a party to various other claims, legal actions and complaints arising in the ordinary course of business. While the results cannot be predicted with certainty, management believes the ultimate resolution of these claims, legal actions and complaints after consideration of amounts accrued, insurance coverage or other indemnification arrangements will not have a material adverse effect on our results of operations, financial position or cash flows.