Equity And Stock-Based Compensation (Schedule Of Stock Options Outstanding And Exercisable) (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Equity And Stock-Based Compensation [Line Items]
Weighted Average Exercise Price of Options Outstanding, Granted	$ 7.40	$ 5.55
Class A [Member]
Equity And Stock-Based Compensation [Line Items]
Common Stock Options Outstanding, Beginning balance	709,850	672,350	672,350
Common Stock Options Outstanding, Granted	20,000	20,000	175,000
Common Stock Options Outstanding, Exercised	(500)		(137,500)
Common Stock Options Outstanding, Ending balance	729,350		709,850
Weighted Average Exercise Price of Options Outstanding, Beginning price	$ 6.24	$ 6.24	$ 6.24
Weighted Average Exercise Price of Options Outstanding, Granted	$ 7.40		$ 6.19
Weighted Average Exercise Price of Options Outstanding, Exercised	$ 6.23		$ 4.00
Weighted Average Exercise Price of Options Outstanding, Ending price	$ 6.68		$ 6.24
Common Stock Exercisable Options, Outstanding Beginning balance	490,350	546,350	546,350
Common Stock Exercisable Options, Outstanding Ending balance	510,350		490,350
Weighted Average Price of Exercisable Options, Outstanding Beginning balance	$ 6.85	$ 6.26	$ 6.26
Weighted Average Price of Exercisable Options, Outstanding Ending balance	$ 6.87		$ 6.85
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	185,100	185,100
Common Stock Exercisable Options, Outstanding Ending balance	185,100		185,100
Weighted Average Price of Exercisable Options, Outstanding Beginning balance	$ 9.90	$ 9.90	$ 9.90
Weighted Average Price of Exercisable Options, Outstanding Ending balance	$ 9.90		$ 9.90