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Equity-Based Compensation Plans Employee Plans Equity Based Compensation Expense (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Employee equity-based compensation $ 6,876 $ 8,334 $ 6,658
Related tax benefit 2,049 2,886 2,290
Restricted stock units
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Employee equity-based compensation 1,801 970 1,212
Performance Shares [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Employee equity-based compensation $ 5,075 $ 7,364 $ 5,446