Equity And Stock-Based Compensation (Schedule Of Stock Options Outstanding And Exercisable) (Details) (USD $)	6 Months Ended		12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Equity And Stock-Based Compensation [Line Items]
Common Stock Options Outstanding, Exercised	(50,000)	(95,000)
Weighted Average Exercise Price of Options Outstanding, Granted	$ 5.89	$ 4.99
Class A [Member]
Equity And Stock-Based Compensation [Line Items]
Common Stock Options Outstanding, Beginning balance	672,350	622,350	622,350
Common Stock Options Outstanding, Granted	50,000	40,000	206,000
Common Stock Options Outstanding, Exercised	(125,000)		(136,000)
Common Stock Options Outstanding, Expired			(20,000)
Common Stock Options Outstanding, Ending balance	597,350		672,350
Weighted Average Exercise Price of Options Outstanding, Beginning price	$ 6.24	$ 5.65	$ 5.65
Weighted Average Exercise Price of Options Outstanding, Granted	$ 5.89		$ 5.94
Weighted Average Exercise Price of Options Outstanding, Exercised	$ 4.01		$ 4.68
Weighted Average Exercise Price of Options Outstanding, Expired			$ 3.75
Weighted Average Exercise Price of Options Outstanding, Ending price	$ 6.67		$ 6.24
Common Stock Exercisable Options, Outstanding Beginning balance	546,350	544,383	544,383
Common Stock Exercisable Options, Outstanding Ending balance	471,350		546,350
Weighted Average Price of Exercisable Options, Outstanding Beginning balance	$ 6.26	$ 5.86	$ 5.86
Weighted Average Price of Exercisable Options, Outstanding Ending balance	$ 6.81		$ 6.26
Class B [Member]
Equity And Stock-Based Compensation [Line Items]
Common Stock Options Outstanding, Beginning balance	185,100	185,100	185,100
Common Stock Options Outstanding, Granted
Common Stock Options Outstanding, Ending balance	185,100		185,100
Weighted Average Exercise Price of Options Outstanding, Beginning price	$ 9.90	$ 9.90	$ 9.90
Weighted Average Exercise Price of Options Outstanding, Granted
Weighted Average Exercise Price of Options Outstanding, Ending price	$ 9.90		$ 9.90
Common Stock Exercisable Options, Outstanding Beginning balance	185,100	167,550	167,550
Common Stock Exercisable Options, Outstanding Ending balance	185,100		185,100
Weighted Average Price of Exercisable Options, Outstanding Beginning balance	$ 9.90	$ 10.05	$ 10.05
Weighted Average Price of Exercisable Options, Outstanding Ending balance	$ 9.90		$ 9.90