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Stock-Based Compensation Expense (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum number of shares reserved for grants 7,105,838    
Stock-based compensation expense [Abstract]      
Stock-based compensation expense $ 6,141 $ 3,742 $ 4,053
Less: related tax benefit 1,972 1,220 1,116
Net stock-based compensation expense 4,169 2,522 2,937
Stock Option [Member]
     
Stock-based compensation expense [Abstract]      
Stock-based compensation expense 1,958 1,648 2,039
Restricted stock units (RSUs)
     
Stock-based compensation expense [Abstract]      
Stock-based compensation expense 2,435 2,094 2,014
Performance Share Units [Member]
     
Stock-based compensation expense [Abstract]      
Stock-based compensation expense $ 1,748 $ 0 $ 0