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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
6 Months Ended
Jun. 30, 2013
RSUs [Member]
 
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Unvested, Shares, Beginning balance 732
Unvested, Weighted-average grant-date fair value, Beginning balance $ 33.33
Forfeited, Shares (94)
Forfeited, Weighted-average grant-date fair value $ 33.94
Vested, Shares (248)
Vested, Weighted-average grant-date fair value $ 32.74
Granted, Shares 226
Granted, Weighted-average grant-date fair value $ 30.04
Unvested, Shares, Ending balance 616
Unvested, Weighted-average grant-date fair value, Ending balance $ 32.30
Performance Shares [Member]
 
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Unvested, Shares, Beginning balance 729 [1]
Unvested, Weighted-average grant-date fair value, Beginning balance $ 40.41
Forfeited, Shares (328)
Forfeited, Weighted-average grant-date fair value $ 38.00
Vested, Shares (31)
Vested, Weighted-average grant-date fair value $ 35.49
Granted, Shares 277
Granted, Weighted-average grant-date fair value $ 29.15
Unvested, Shares, Ending balance 647 [1]
Unvested, Weighted-average grant-date fair value, Ending balance $ 37.04
Deferred Compensation, Share-based Payments [Member]
 
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Unvested, Shares, Beginning balance 20
Unvested, Weighted-average grant-date fair value, Beginning balance $ 40.54
Forfeited, Shares (3)
Forfeited, Weighted-average grant-date fair value $ 40.54
Vested, Shares (17)
Vested, Weighted-average grant-date fair value $ 40.54
Granted, Shares 31
Granted, Weighted-average grant-date fair value $ 29.73
Unvested, Shares, Ending balance 31
Unvested, Weighted-average grant-date fair value, Ending balance $ 29.73
Vested, Shares, Ending Balance 103
Vested, Weighted-average grant-date fair value, Ending balance $ 35.54
Outstanding, Shares, End Balance 134
Outstanding, Weighted-average grant-date fair value, Ending balance $ 34.20
[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.