Equity And Stock-Based Compensation (Schedule Of Stock Options Outstanding And Exercisable) (Details) (USD $)	3 Months Ended			9 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Sep. 30, 2014	Sep. 30, 2013
Equity And Stock-Based Compensation [Line Items]
Weighted Average Exercise Price of Options Outstanding, Granted				$ 7.40	$ 5.89
Class A [Member]
Equity And Stock-Based Compensation [Line Items]
Common Stock Options Outstanding, Beginning balance	652,350	729,350	709,850	709,850
Common Stock Options Outstanding, Granted			20,000	20,000	50,000
Common Stock Options Outstanding, Exercised	(63,600)	(77,000)	(500)
Common Stock Options Outstanding, Forfeited	(64,000)			(64,000)
Common Stock Options Outstanding, Ending balance	524,750	652,350	729,350	524,750
Weighted Average Exercise Price of Options Outstanding, Beginning price	$ 6.71	$ 6.60	$ 6.24	$ 6.24
Weighted Average Exercise Price of Options Outstanding, Granted
Weighted Average Exercise Price of Options Outstanding, Ending price	$ 6.60	$ 6.71	$ 6.60	$ 6.60
Common Stock Exercisable Options, Outstanding Beginning balance	435,350	510,350	490,350	490,350
Common Stock Exercisable Options, Outstanding Ending balance	347,250	435,350	510,350	347,250
Weighted Average Price of Exercisable Options, Outstanding Beginning balance	$ 6.95	$ 6.87	$ 6.85	$ 6.85
Weighted Average Price of Exercisable Options, Outstanding Ending balance	$ 6.78	$ 6.95	$ 6.87	$ 6.78
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	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	$ 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	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	$ 9.90	$ 9.90