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Stock-Based Compensation (Narrative) (Details) (USD $)
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6 Months Ended | 12 Months Ended | 3 Months Ended | 6 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 6 Months Ended | 3 Months Ended | |||||||
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Jun. 30, 2012
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Jun. 30, 2011
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Dec. 31, 2011
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Mar. 31, 2012
Executive Incentive Compensation Plan [Member]
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Jun. 30, 2012
Executive Incentive Compensation Plan [Member]
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Mar. 28, 2011
Executive Incentive Compensation Plan [Member]
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Jun. 30, 2012
1992 Stock Plan [Member]
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Dec. 31, 2011
1992 Stock Plan [Member]
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Jun. 30, 2012
Stock Option Plan For Directors [Member]
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Mar. 31, 2012
Key Executive Employees [Member]
Executive Incentive Compensation Plan [Member]
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Mar. 31, 2012
Key Employees [Member]
Executive Incentive Compensation Plan [Member]
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Dec. 31, 2011
Tied To Achievement Of 2010 Performance Goals [Member]
1992 Stock Plan [Member]
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Dec. 31, 2011
Tied To Achievement Of 2011 To 2013 Performance Goals [Member]
1992 Stock Plan [Member]
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Jun. 30, 2012
Employee Stock Purchase Plan [Member]
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Jun. 30, 2012
Restricted Stock [Member]
Executive Incentive Compensation Plan [Member]
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Jun. 30, 2012
Restricted Stock [Member]
Non-Employee Directors [Member]
Executive Incentive Compensation Plan [Member]
employee
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||||||||||||
| Percentage of price of common stock at which employees are able to acquire | 90.00% | |||||||||||||||
| Awards avaliable for grant | 765,008 | 155,948 | 59,477 | |||||||||||||
| Awards granted | 25,879 | |||||||||||||||
| Value of awards granted | $ 40,000 | |||||||||||||||
| Share-based compensation arrangement by share-based payment, vesting period | 1 year | |||||||||||||||
| Number of awards authorized | 1,000,000 | |||||||||||||||
| Number of employees receiving awards | 7 | |||||||||||||||
| Number of options granted | 92,223 | 96,250 | ||||||||||||||
| Options expiration period, years | 5 years 5 months 27 days | 5 years 2 months 5 days | 7 years | 7 years | 10 years | |||||||||||
| Percentage of options vest each year | 25.00% | 25.00% | ||||||||||||||
| Granted deferred stock awards to employees | 12,156 | 9,456 | 94,242 | 16,092 | 77,588 | |||||||||||
| Minimum percentage of revenue growth required to earn deferred stock | 150.00% | 150.00% | ||||||||||||||
| Aggregate intrinsic value of options outstanding | 182,000 | |||||||||||||||
| Intrinsic value of all options exercised | 59,000 | |||||||||||||||
| Net cash proceeds from exercise of stock options | 86,000 | 73,000 | ||||||||||||||
| Share based compensation expense before income taxes | 223,000 | 249,000 | ||||||||||||||
| Share based compensation expense after income taxes | 145,000 | 162,000 | ||||||||||||||
| Unrecognized compensation expense | 1,011,000 | |||||||||||||||
| Excess tax benefits from exercise of stock options | $ 68,000 | $ 23,000 | ||||||||||||||