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Stock-Based Compensation (Narrative) (Details) (USD $)
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6 Months Ended | 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, 2013
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Jun. 30, 2012
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Jun. 30, 2013
Employee Stock Purchase Plan [Member]
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Mar. 31, 2013
2011 Executive Incentive Compensation Plan [Member]
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Jun. 30, 2013
2011 Executive Incentive Compensation Plan [Member]
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Jun. 30, 2013
Stock Option Plan For Directors [Member]
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Dec. 31, 2012
Stock Option Plan For Directors [Member]
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Jun. 30, 2013
1992 Stock Plan [Member]
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Mar. 31, 2013
Key Employees [Member]
2011 Executive Incentive Compensation Plan [Member]
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Mar. 31, 2013
Key Executive Employees [Member]
2011 Executive Incentive Compensation Plan [Member]
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Jun. 30, 2013
Key Executive Employees [Member]
2011 Executive Incentive Compensation Plan [Member]
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Jun. 30, 2013
Restricted Stock Units (RSUs) [Member]
2011 Executive Incentive Compensation Plan [Member]
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Jun. 30, 2013
Restricted Stock Units (RSUs) [Member]
2011 Executive Incentive Compensation Plan [Member]
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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% | ||||||||||||
| Shares available | 43,021 | 457,899 | 140,216 | ||||||||||
| Number of awards authorized | 1,000,000 | ||||||||||||
| Number of options granted | 0 | 0 | 0 | 160,302 | |||||||||
| Award expiration period | 10 years | 7 years | |||||||||||
| Award vesting percentage | 25.00% | ||||||||||||
| Awards granted | 190,108 | 28,280 | |||||||||||
| Deferred stock awards granted | 11,576 | 0 | 177,532 | ||||||||||
| Minimum percentage of revenue growth required to earn deferred stock | 150.00% | ||||||||||||
| Number of non-employee directors to receive restricted stock units | 7 | ||||||||||||
| Value of restricted stock units granted for each non-employee director | $ 40,000 | ||||||||||||
| Award vesting period | 1 year | ||||||||||||
| Aggregate intrinsic value of options outstanding | 20,000 | ||||||||||||
| Net cash proceeds from exercise of stock options | 110,000 | 86,000 | |||||||||||
| Intrinsic value of all options exercised | 38,000 | ||||||||||||
| Share based compensation expense before income taxes | (51,000) | 223,000 | |||||||||||
| Share based compensation expense after income taxes | (33,000) | 145,000 | |||||||||||
| Unrecognized compensation expense related to deferred stock shares | 800,000 | ||||||||||||
| Excess tax benefits from exercise of stock options | $ 14,000 | $ 68,000 | |||||||||||