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Stock-Based Compensation (Schedule of Share-based Compensation, Stock Options, Activity) (Details) (USD $)
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12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| Options (in shares) | |||
| Balance at beginning of year | 111,571 | 139,446 | 144,370 |
| Granted | 0 | 5,507 | 32,399 |
| Exercised/Released | 0 | (5,250) | 0 |
| Cancelled / forfeited | (20,482) | (17,326) | (29,213) |
| Expired | (5,188) | (10,806) | (8,110) |
| Balance at end of year | 85,901 | 111,571 | 139,446 |
| Exercisable at end of year | 67,407 | 73,665 | 50,997 |
| Weighted-average exercise price (in dollars per share) | |||
| Balance at beginning of year | $ 38.92 | $ 53.66 | $ 68.90 |
| Granted | $ 0.00 | $ 6.80 | $ 4.77 |
| Exercised/Released | $ 0.00 | $ 5.70 | $ 0.00 |
| Cancelled / forfeited | $ 33.90 | $ 124.87 | $ 71.78 |
| Expired | $ 125.83 | $ 90.72 | $ 68.97 |
| Balance at end of year | $ 34.85 | $ 38.92 | $ 53.66 |