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Compensation Expense for Restricted Stock and Performance Units (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Impact on income before income taxes $ (3,588) $ (3,637)
Income tax benefit 1,396 1,413
Impact on net income (2,192) (2,224)
Restricted Stock
   
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Impact on income before income taxes (3,321) (3,637)
Performance Units
   
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Impact on income before income taxes $ (267) $ 0