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Share-Based Compensation - Compensation Expense and Information on Non-Vested Shares (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Allocated Share-based Compensation Expense $ 1,907 $ 3,181 $ 5,704 $ 6,617
Performance Shares [Member]
       
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Unvested, Shares, Beginning balance     727 [1]  
Unvested, Weighted-average grant-date fair value, Beginning balance     $ 34.70  
Forfeited, Shares     (216)  
Forfeited, Weighted-average grant-date fair value $ 31.01   $ 31.01  
Vested, Shares     (86)  
Vested, Weighted-average grant-date fair value     $ 29.25  
Granted, Shares     301  
Granted, Weighted-average grant-date fair value     $ 44.25  
Unvested, Shares, Ending balance 726 [1]   726 [1]  
Unvested, Weighted-average grant-date fair value, Ending balance $ 40.40   $ 40.40  
RSUs [Member]
       
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Unvested, Shares, Beginning balance     717  
Unvested, Weighted-average grant-date fair value, Beginning balance     $ 30.69  
Forfeited, Shares     (44)  
Forfeited, Weighted-average grant-date fair value $ 30.43   $ 30.43  
Vested, Shares     (127)  
Vested, Weighted-average grant-date fair value     $ 24.84  
Granted, Shares     235  
Granted, Weighted-average grant-date fair value     $ 35.31  
Unvested, Shares, Ending balance 781   781  
Unvested, Weighted-average grant-date fair value, Ending balance $ 33.05   $ 33.05  
Deferred Compensation, Share-based Payments [Member]
       
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Unvested, Shares, Beginning balance     19  
Unvested, Weighted-average grant-date fair value, Beginning balance     $ 33.98  
Vested, Shares     (19)  
Vested, Weighted-average grant-date fair value     $ 33.98  
Granted, Shares     28  
Granted, Weighted-average grant-date fair value     $ 40.54  
Unvested, Shares, Ending balance 28   28  
Unvested, Weighted-average grant-date fair value, Ending balance $ 40.54   $ 40.54  
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested And Outstanding Number 115   115  
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested And Outstanding Weighted Average Grant Date Fair Value $ 33.90   $ 33.90  
Share Based Compensation Arrangement By Share Based Payment Award Other Than Options Outstanding Number 143   143  
Share Based Compensation Arrangement Award Other Than Options Outstanding Weighted Average Grant Date Fair Value $ 35.22   $ 35.22  
[1] Non-vested performance shares are based on a maximum potential payout. Actual shares granted at the end of the performance period may be less than the maximum potential payout level depending on achievement of performance share objectives.