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Shareholder Rights Agreement (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012
Shareholder Rights Agreement [Abstract]
Portion of shares each Right can buy	0.01
Exercise price of participating cumulative preferred stock, per share	$ 150
Percentage of outstanding common stock shares to be acquired for exercise of rights	15.00%
Percentage of common stock ownership required in a tender offer for exercise of rights	15.00%

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- Definition

Exercise Price of Participating Cumulative Preferred Stock, Per Share

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- Definition

Percentage of common stock ownership required in a tender offer for exercise of rights.

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- Definition

Percentage of outstanding common stock shares to be acquired for exercise of rights.

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- Definition

Portion of shares each Right can buy

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