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Share-Based Compensation and Equity - Restricted Stock Unit Activity (Details) (Restricted Stock Units [Member], USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Restricted Stock Units [Member]
     
Restricted Stock Units      
Unvested, Shares, Beginning balance 732    
Unvested, Weighted-average grant-date fair value, Beginning balance $ 33.33    
Forfeited, Shares (172)    
Forfeited, Weighted-average grant-date fair value $ 32.90    
Vested, Shares (311)    
Vested, Weighted-average grant-date fair value $ 32.72    
Granted, Shares 250    
Granted, Weighted-average grant-date fair value $ 30.14 $ 35.16 $ 32.86
Unvested, Shares, Ending balance 499 732  
Unvested, Weighted-average grant-date fair value, Ending balance $ 32.28 $ 33.33  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value $ 9,176 $ 4,202 $ 3,226