Interest Expense

9 Months Ended

Sep. 30, 2018

Interest Costs Incurred [Abstract]

Interest Income And Interest Expense Disclosure[Text Block]

6. Interest Expense

Interest expense consisted of the following (in thousands):

			Three Months Ended				Nine Months Ended
			September 30,				September 30,
			2018		2017		2018		2017
Senior notes			$	6,359	$	6,559	$	19,213	$	21,127
Credit facility unutilized fee				495		949		1,849		3,328
Federal coal lease obligations imputed interest				69		88		205		259
Amortization of deferred financing costs and
	original issue discount			1,453		1,930		5,151		5,862
Other				35		47		112		193
		Subtotal		8,411		9,573		26,530		30,769
Premium on early retirement of debt				—		—		—		880
Write-off of deferred financing costs and
	original issue discount			—		—		1,611		702
		Total cost of early retirement of debt and
		refinancings		—		—		1,611		1,582
Total interest expense			$	8,411	$	9,573	$	28,141	$	32,351

Debt issuance costs of $1.6 million, related to a decrease in the Amended Credit Agreement’s borrowing capacity, were written off in the nine months ended September 30,2018. See Note 14 for a discussion of the changes in the Amended Credit Agreement.

In connection with the public offering discussed in Note 13, upon redemption of the 2019 Notes (defined in Note 13), we paid $1.5 million in accrued and unpaid interest, $0.9 million in premium on the early retirement of debt, and wrote off $0.7 million in deferred financing and original issue discount in the nine months ended September 30,2017.