Other Long-Term Assets and Other Income (Schedule of Other Long-Term Assets) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Long-term assets:
Advance coal royalties	$ 5,496		$ 4,693
Deferred financing costs, net	6,507		1,195
Marketable equity securities available for sale, at fair value (restricted)	2,249	[1]	3,889	[1]
Ohio River Terminal (see Note 9)	2,653		2,836
Other	1,944		2,769
Long-term assets	$ 18,849		$ 15,382

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