Segment Information (Schedule of Revenue from External Customers Long-Lived Assets, by Geographical Areas) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Segment Reporting Information [Line Items]
Net Operating Revenue	$ 17,791	$ 18,002	$ 35,360	$ 35,117
United States [Member]
Segment Reporting Information [Line Items]
Net Operating Revenue	7,731	7,731	15,119	14,969
Canada [Member]
Segment Reporting Information [Line Items]
Net Operating Revenue	8,404	8,652	16,947	16,994
International Waters [Member]
Segment Reporting Information [Line Items]
Net Operating Revenue	1,578	1,509	3,138	2,931
Aruba [Member]
Segment Reporting Information [Line Items]
Net Operating Revenue	78	110	156	223
International [Member]
Segment Reporting Information [Line Items]
Net Operating Revenue	$ 10,060	$ 10,271	$ 20,241	$ 20,148