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Incentive Compensation (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Share Based Compensation Expense (in dollars) $ 9,051 $ 9,129 $ 20,075 $ 16,595
Out Performance Plan 2014 [Member]
       
Out Performance Plan [Abstract]        
Duration Of Performance Measurement Period     3 years  
Award vesting in three years     33.00%  
Award vesting in four years     33.00%  
Award vesting in five years     34.00%  
Out Performance Plan 2014 [Member] | Absolute [Member]
       
Out Performance Plan [Abstract]        
Required Shareholder Return Per Year     7.00%  
Required Shareholder Return Three Year     21.00%  
Out Performance Plan 2014 [Member] | Relative [Member]
       
Out Performance Plan [Abstract]        
Required Shareholder Return Under Relative Component     6.00%  
Percentage Of Shareholder Return Under Which No Awards Will Be Earned     0.00%  
Out Performance Plan [Member]
       
Out Performance Plan [Abstract]        
OPP awards held by executives after vesting, period     1 year