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Share-Based Compensation and Equity - Performance Shares Activity (Details) (Performance Shares [Member], USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Performance Shares [Member]
     
Performance Shares      
Unvested, Shares, Beginning balance 729    
Unvested, Weighted-average grant-date fair value, Beginning balance $ 40.41    
Forfeited, Shares (433)    
Forfeited, Weighted-average grant-date fair value $ 37.70    
Vested, Shares (31)    
Vested, Weighted-average grant-date fair value $ 35.49    
Granted, Shares 277    
Granted, Weighted-average grant-date fair value $ 29.15 $ 44.25 $ 39.85
Unvested, Shares, Ending balance 542 729  
Unvested, Weighted-average grant-date fair value, Ending balance $ 37.10 $ 40.41  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value $ 1,090 $ 2,521 $ 5,041