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Other Events and Transactions	9 Months Ended
Other Events and Transactions	Sep. 30, 2019
Other Income and Expenses [Abstract]
Other Events and Transactions	Other Events and Transactions North American Coal Corporation India Private Limited ("NACC India") was formed to provide technical business advisory services to the third-party owner of a coal mine in India. During 2014, NACC India's customer defaulted on its contractual payment obligations and as a result of this default, NACC India terminated its contract with the customer and began pursuing contractual remedies. During the third quarter of 2019, the Company received payment of $2.7 million from NACC India's customer, of which $1.4 million related to past invoices and has been reported on the line Other, net, and $1.3 million represented interest income and has been reported on the line Interest income. Both of these lines are in the Other (income) expense section of the Unaudited Condensed Consolidated Statements of Operations.