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Equity And Stock-Based Compensation (Narrative) (Details) (USD $)
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3 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Jun. 30, 2014
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Jun. 30, 2013
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Jun. 30, 2014
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Jun. 30, 2013
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Dec. 31, 2013
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Jun. 30, 2014
Class A Nonvoting Common Stock [Member]
Executive Officer [Member]
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Jun. 30, 2013
Class A Nonvoting Common Stock [Member]
Executive Officer [Member]
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Jun. 30, 2014
Class A Nonvoting Common Stock [Member]
Employee/Director [Member]
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Jun. 30, 2013
Class A Nonvoting Common Stock [Member]
Employee/Director [Member]
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Jun. 30, 2014
Class A [Member]
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Mar. 31, 2014
Class A [Member]
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Jun. 30, 2013
Class A [Member]
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Jun. 30, 2014
Class A [Member]
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Jun. 30, 2013
Class A [Member]
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Jun. 30, 2014
Class B [Member]
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Mar. 31, 2014
Class B [Member]
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Jun. 30, 2014
Minimum [Member]
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Jun. 30, 2014
Maximum [Member]
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| Equity And Stock-Based Compensation [Line Items] | ||||||||||||||||||
| Stocks granted | 125,209 | 217,890 | ||||||||||||||||
| Compensation expense | $ 300,000 | $ 188,000 | $ 600,000 | $ 376,000 | ||||||||||||||
| Options granted | 20,000 | 20,000 | 50,000 | |||||||||||||||
| Grant date fair value of options vesting | 34,000 | 77,000 | 68,000 | 130,000 | ||||||||||||||
| Unrecognized estimated compensation cost related to non-vested stock options granted | 438,000 | 438,000 | ||||||||||||||||
| Recognition period of unrecognized compensation cost | 2 years 1 month 24 days | |||||||||||||||||
| Options exercised | 77,500 | 50,000 | 77,000 | 500 | ||||||||||||||
| Realized value of option exercised | 156,000 | 99,500 | ||||||||||||||||
| Cash received from exercise of stock options | 494,712 | 200,500 | ||||||||||||||||
| Intrinsic unrealized value of all options outstanding, vested and expected to vest | $ 1,400,000 | $ 1,400,000 | ||||||||||||||||
| Percentage of option currently exercisable | 62.00% | |||||||||||||||||
| 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 | 4 years 5 months 9 days | 4 years 8 months 12 days | ||||||||||||||||
| Weighted average remaining contractual life of the exercisable options outstanding | 3 years 4 months 10 days | 3 years 7 months 17 days | ||||||||||||||||