Segment Information (Schedule of Revenue from External Customers Long-Lived Assets, by Geographical Areas) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Segment Reporting Information [Line Items]
Net Operating Revenue	$ 18,723	$ 18,146	$ 54,082	$ 53,263
United States [Member]
Segment Reporting Information [Line Items]
Net Operating Revenue	8,434	8,257	23,553	23,227
Canada [Member]
Segment Reporting Information [Line Items]
Net Operating Revenue	8,428	8,301	25,371	25,294
International Waters [Member]
Segment Reporting Information [Line Items]
Net Operating Revenue	1,778	1,508	4,919	4,440
Aruba [Member]
Segment Reporting Information [Line Items]
Net Operating Revenue	83	80	239	302
International [Member]
Segment Reporting Information [Line Items]
Net Operating Revenue	$ 10,289	$ 9,889	$ 30,529	$ 30,036