Significant Operations (Revenues Attributable To Major Geographic Areas) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Summary of revenues attributable to the major geographic areas [Abstract]
Total Revenues	$ 76,193	$ 77,938	$ 74,897	$ 81,124	$ 56,810	$ 61,162	$ 60,320	$ 65,204	$ 310,152	$ 243,496	$ 263,196
United States [Member]
Summary of revenues attributable to the major geographic areas [Abstract]
Total Revenues									192,332	123,782
Asian Countries [Member]
Summary of revenues attributable to the major geographic areas [Abstract]
Total Revenues									67,830	63,860
Rail-Ferry Service [Member]
Summary of revenues attributable to the major geographic areas [Abstract]
Total Revenues									34,390	32,479
South America [Member]
Summary of revenues attributable to the major geographic areas [Abstract]
Total Revenues									2,905	10,416
Europe [Member]
Summary of revenues attributable to the major geographic areas [Abstract]
Total Revenues									6,966	12,474
Other Countries [Member]
Summary of revenues attributable to the major geographic areas [Abstract]
Total Revenues									$ 5,729	$ 485