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Share-based Compensation Unrecognized Compensation Expense for Share-Based Awards (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized compensation expense $ 36,568
Remaining weighted-average recognition period 2 years 9 months 23 days
Restricted Stock
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized compensation expense 30,543
Remaining weighted-average recognition period 2 years 8 months 25 days
Performance Units
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized compensation expense $ 6,025
Remaining weighted-average recognition period 3 years 4 months 13 days