|
Stockholder Protection Rights Plan (Details) (USD $)
|
12 Months Ended |
|
Dec. 31, 2014
Right
|
| Stockholder Protection Rights Plan [Abstract] |
|
| Number of right for each outstanding share |
1 |
| Proportion of right entitles to purchase series A preferred stock |
1/10,000th |
| Rights exercise price (in dollars per share) |
$ 30 |
| Number of business days after announcement rights are not exercisable for certain persons |
10 days |
| Beneficial ownership percentage of company outstanding shares of common stock by acquiring person (in hundredths) |
15.00% |
| Percentage of company outstanding shares of common stock by acquiring person (in hundredths) |
50.00% |