Segment Information (Schedule of Revenue from External Customers Long-Lived Assets, by Geographical Areas) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Segment Reporting Information [Line Items]
Net Operating Revenue	$ 17,991	$ 17,569
United States [Member]
Segment Reporting Information [Line Items]
Net Operating Revenue	7,339	7,389
Canada [Member]
Segment Reporting Information [Line Items]
Net Operating Revenue	8,810	8,542
International Waters [Member]
Segment Reporting Information [Line Items]
Net Operating Revenue	1,749	1,560
Aruba [Member]
Segment Reporting Information [Line Items]
Net Operating Revenue	93	78
International [Member]
Segment Reporting Information [Line Items]
Net Operating Revenue	$ 10,652	$ 10,180