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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
Mar. 31, 2012
Mar. 31, 2011
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Allocated Share-based Compensation Expense $ 3,797 $ 3,435
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 (207)  
Forfeited, Weighted-average grant-date fair value $ 30.55  
Vested, Shares (86)  
Vested, Weighted-average grant-date fair value $ 29.25  
Granted, Shares 285  
Granted, Weighted-average grant-date fair value $ 44.25  
Unvested, Shares, Ending balance 719 [1]  
Unvested, Weighted-average grant-date fair value, Ending balance $ 40.33  
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 (29)  
Forfeited, Weighted-average grant-date fair value $ 29.65  
Vested, Shares (130)  
Vested, Weighted-average grant-date fair value $ 24.91  
Granted, Shares 209  
Granted, Weighted-average grant-date fair value $ 34.97  
Unvested, Shares, Ending balance 767  
Unvested, Weighted-average grant-date fair value, Ending balance $ 32.88  
Deferred Compensation, Share-based Payments [Member]
   
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Unvested, Shares, Ending balance 19  
Unvested, Weighted-average grant-date fair value, Ending balance $ 33.98  
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested And Outstanding Number 96  
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested And Outstanding Weighted Average Grant Date Fair Value $ 33.88  
Share Based Compensation Arrangement By Share Based Payment Award Other Than Options Outstanding Number 115  
Share Based Compensation Arrangement Award Other Than Options Outstanding Weighted Average Grant Date Fair Value $ 33.90  
[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.