Equity And Stock-Based Compensation (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended	9 Months Ended				3 Months Ended				9 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Sep. 30, 2014 Class A Nonvoting Common Stock [Member] Executive Officer [Member]	Sep. 30, 2013 Class A Nonvoting Common Stock [Member] Executive Officer [Member]	Sep. 30, 2014 Class A Nonvoting Common Stock [Member] Employee/Director [Member]	Sep. 30, 2013 Class A Nonvoting Common Stock [Member] Employee/Director [Member]	Sep. 30, 2014 Class A [Member]	Jun. 30, 2014 Class A [Member]	Mar. 31, 2014 Class A [Member]	Sep. 30, 2013 Class A [Member]	Sep. 30, 2014 Class A [Member]	Sep. 30, 2013 Class A [Member]	Jun. 30, 2014 Class B [Member]	Mar. 31, 2014 Class B [Member]	Sep. 30, 2014 Minimum [Member]	Sep. 30, 2014 Maximum [Member]
Equity And Stock-Based Compensation [Line Items]
Stocks granted						125,209	217,890
Unrecognized tax benefits from stock option exercises	$ 0	$ 0	$ 0	$ 0
Compensation expense										300,000			188,000	900,000	564,000
Forfeitures during period										64,000				64,000
Options granted												20,000		20,000	50,000
Grant date fair value of options vesting	33,000	77,000	102,000	130,000
Unrecognized estimated compensation cost related to non-vested stock options granted	385,000		385,000
Recognition period of unrecognized compensation cost			1 year 11 months 16 days
Options exercised								141,100	62,500	63,600	77,000	500
Realized value of option exercised								285,000	132,000
Cash received from exercise of stock options								890,000	249,000
Intrinsic unrealized value of all options outstanding, vested and expected to vest	$ 1,100,000		$ 1,100,000
Percentage of option currently exercisable			66.20%
Expiration period for stock options			10 years
Vesting period of stock options																		0 years	4 years
Common Stock authorized for issuance under 2010 Stock Incentive Plan	1,250,000		1,250,000
Weighted average remaining contractual life of all options outstanding, vested, and expected to vest			3 years 6 months 4 days		4 years 8 months 12 days
Weighted average remaining contractual life of the exercisable options outstanding			3 years 5 months 12 days		3 years 7 months 17 days