(5) Other Long-term Assets and Other Income (In thousands) (Details) - Other Long-term Assets and Other Income (in thousands) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2014		Dec. 31, 2013		May 31, 2013
Long-term assets:
Advance coal royalties	$ 4,655		$ 4,693
Deferred financing costs, net	1,120		1,195
Marketable equity securities available for sale, at fair value (restricted)*	2,353	[1]	3,889	[1]
Ohio River Terminal (see Note 7)	2,790		2,836		2,800
Other	5,887		4,792
	16,805		17,405
Other income:
MSHA reimbursements*			2,053	[2]
Coal storage fees	63		232
Miscellaneous	220		176
	$ 283		$ 2,461

[1] *Held by Sunrise Indemnity, Inc., our wholly-owned captive insurance company.

[2] *See "MSHA Reimbursements" on page 17.