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SUBSEQUENT EVENTS	12 Months Ended
SUBSEQUENT EVENTS	Dec. 31, 2016
Subsequent Events [Abstract]
SUBSEQUENT EVENTS	23. SUBSEQUENT EVENTS On March 24, 2017, the Company received $52.5 million from its customer at the Genesee mine, representing an accelerated repayment of all outstanding loan and lease receivables. Westmoreland’s obligation to continue contract mining at the Genesee mine survives this repayment, but the Company has no further obligation to fund future capital expenditures at the mine. The Company has evaluated subsequent events in accordance with ASC 855, Subsequent Events, through the filing of its Annual Report, and determined that there have been no other events that have occurred that would require adjustments to disclosures in the consolidated financial statements.