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Stockholders' Equity (Details) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	1 Months Ended	3 Months Ended
	Mar. 31, 2011	Mar. 31, 2012
Stockholders' Equity [Abstract]
Stock repurchase program, authorized amount	$ 150.0
Stock repurchase plan, shares repurchased and retired		203,900
Stock repurchase plan, purchase price		$ 2.5

Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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