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Earnings Per Share (Details) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Numerator (in millions):      
Net income available to common stockholders $ 68.3 $ 48.9 $ 73.7
Denominator (in thousands):      
Weighted average common shares outstanding 23,187 23,568 23,756
Dilutive effect of stock options and awards 663 952 1,058
Denominator for diluted earnings per share 23,850 24,520 24,814
Net income per share, basic: $ 2.95 $ 2.07 $ 3.10
Net income per share, diluted: $ 2.86 $ 1.99 $ 2.97