Seat Licenses And Other Intangible Assets (Components Of Other Intangible Assets) (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Gross Value	$ 7,895	$ 7,895
Accumulated Amortization	(3,300)	(2,875)
Net Value	$ 4,595	$ 5,020
Seat Licenses [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives	5 years	5 years
Gross Value	$ 3,376	$ 2,936
Accumulated Amortization	(1,687)	(1,393)
Net Value	$ 1,689	$ 1,543
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives	8 years	8 years
Gross Value	$ 5,400	$ 5,400
Accumulated Amortization	(2,643)	(2,306)
Net Value	$ 2,757	$ 3,094
Trade Name [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives	15 years	5 years
Gross Value	$ 2,400	$ 2,400
Accumulated Amortization	(627)	(547)
Net Value	$ 1,773	$ 1,853
Website [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives	12 years	12 years
Gross Value	$ 95	$ 95
Accumulated Amortization	(30)	(22)
Net Value	$ 65	$ 73