(6) Other Long-Term Assets and Other Income (Details) - Other Long-Term Assets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013		May 31, 2013	Dec. 31, 2012
Long-term assets:
Advance coal royalties	$ 3,936			$ 3,324
Deferred financing costs, net	1,270			1,494
Marketable equity securities available for sale, at fair value (restricted)*	3,601	[1]		3,548	[1]
Ohio River Terminal (see Note 8)	2,881		2,800
Miscellaneous	3,503			2,941
	$ 15,191			$ 11,307

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