Commitments and Contingencies (Tables)

6 Months Ended

Jun. 30, 2018

Commitments and Contingencies Disclosure [Abstract]

Schedule of Delivery Commitments

Coal Sales Contracts and Contingencies—As of June 30, 2018, the Partnership had commitments under sales contracts to deliver annually scheduled base quantities of coal as follows:

Year		Tons (in thousands)		Number of customers
	2018 Q3-Q4		2,475		18
	2019		2,020		8
	2020		1,146		5

Schedule of Lease and Royalty Expense

Lease and royalty expense for the three and six months ended June 30, 2018 and 2017 are included in Cost of operations in the Partnership’s unaudited condensed consolidated statements of operations and comprehensive income and was as follows:

	Three months ended June 30,				Six months ended June 30,
	2018		2017		2018		2017
	(in thousands)
Lease expense	$	976	$	968	$	1,406	$	2,472
Royalty expense	$	3,467	$	3,924	$	7,111	$	7,286