Other Long-term Assets and Other Income (Schedule of Other Long-Term Assets) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014		Dec. 31, 2013
Long-term assets:
Advance coal royalties	$ 5,188		$ 4,693
Deferred financing costs, net	1,166		1,195
Marketable equity securities available for sale, at fair value (restricted)*	2,503	[1]	3,889	[1]
Ohio River Terminal (see Note 7)	2,744		2,836
Other	5,399		4,792
Long-term assets	$ 17,000		$ 17,405

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