Miscellaneous Other Income (Tables)

12 Months Ended

Dec. 31, 2017

Component of Operating Income [Abstract]

Schedule of Miscellaneous Other Income

	For the Years Ended December 31,
	2017		2016		2015
Royalty Income - Non-Operated Coal	$	28,089	$	19,739	$	15,356
Rental Income	14,114		34,789		36,908
Purchased Coal Sales	13,161		5,757		1,596
Coal Contract Buyout	9,912		6,288		—
Interest Income	2,619		1,166		410
Right of Way Issuance	2,436		11,281		10,827
Other	2,948		3,100		3,096
Miscellaneous Other Income	$	73,279	$	82,120	$	68,193