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Common Stock Repurchase Program (Details) (USD $)	12 Months Ended
Common Stock Repurchase Program (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Equity, Class of Treasury Stock [Line Items]
Stock Repurchase Program, Authorized Amount	$ 20,000,000
Stock Repurchased During Period, Value		3,920,000
Payments for Repurchase of Common Stock	$ 0	$ 3,920,000	$ 0

The cash outflow to reacquire common stock during the period.

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- Definition

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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