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Stock-Based Compensation (Narrative) (Details) (USD $)
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1 Months Ended | 3 Months Ended | 9 Months Ended | 1 Months Ended | 9 Months Ended | 9 Months Ended | |||||||||
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Jun. 30, 2013
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Sep. 30, 2013
plan
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Sep. 30, 2012
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Sep. 30, 2013
plan
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Sep. 30, 2012
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Jul. 31, 2013
Unvested Restricted Stock [Member]
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Apr. 30, 2013
Unvested Restricted Stock [Member]
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Mar. 31, 2013
Unvested Restricted Stock [Member]
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Feb. 28, 2013
Unvested Restricted Stock [Member]
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Sep. 30, 2013
Unvested Restricted Stock [Member]
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Sep. 30, 2013
Stock Incentive Plan Nineteen Ninety Six [Member]
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Sep. 30, 2013
The 2002 Plan [Member]
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Sep. 30, 2013
The 1996 Plan and the 2002 Plan [Member]
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Sep. 30, 2013
The 1996 Plan and the 2002 Plan [Member]
Minimum [Member]
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Sep. 30, 2013
The 1996 Plan and the 2002 Plan [Member]
Maximum [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||||||||||||
| Number of stock based compensation plans in which instruments are outstanding | 2 | 2 | |||||||||||||
| Total number of shares authorized | 1,500,000.0 | 12,000,000 | |||||||||||||
| Stock based compensation, granted stock options' vesting period | 1 year | 4 years | |||||||||||||
| Stock based compensation, outstanding stock options' expiration period | 10 years | ||||||||||||||
| Stock based compensation, outstanding stock options' expiration period upon optionee's separation from employment | 90 days | ||||||||||||||
| Stock compensation expense | $ 772,000 | $ 588,000 | $ 2,193,715 | $ 1,722,127 | |||||||||||
| Stock options canceled | 50,000 | ||||||||||||||
| Shares of restricted stock vested | 85,000 | 560,000 | 100,000 | 745,000 | |||||||||||
| Aggregate fair value of restricted stock vested | 224,000 | 1,800,000 | 308,000 | ||||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period | 29,250 | 29,250 | |||||||||||||
| Stock Issued During Period, Value, Share-based Compensation, Forfeited | 48,000 | ||||||||||||||
| Unrecognized compensation cost related to unvested stock-based awards | $ 2,800,000 | $ 2,800,000 | |||||||||||||
| Unrecognized compensation cost related to unvested stock-based awards, weighted average recognition period | 1 year 11 months 22 days | ||||||||||||||