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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
9 Months Ended
Sep. 30, 2012
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 (55)
Forfeited, Weighted-average grant-date fair value $ 30.61
Vested, Shares (130)
Vested, Weighted-average grant-date fair value $ 24.96
Granted, Shares 246
Granted, Weighted-average grant-date fair value $ 35.24
Unvested, Shares, Ending balance 778
Unvested, Weighted-average grant-date fair value, Ending balance $ 33.09
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
Vested, Shares (86)
Vested, Weighted-average grant-date fair value $ 29.25
Granted, Shares 303
Granted, Weighted-average grant-date fair value $ 44.25
Unvested, Shares, Ending balance 728 [1]
Unvested, Weighted-average grant-date fair value, Ending balance $ 40.42
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
Unvested, Weighted-average grant-date fair value, Ending balance $ 40.54
Vested, Shares, Ending Balance 107
Vested, Weighted-average grant-date fair value, Ending balance $ 33.87
Outstanding, Shares, End Balance 135
Outstanding, Weighted-average grant-date fair value, Ending balance $ 35.27
[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.