Incentive Compensation (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share Based Compensation Expense (in dollars)	$ 11,024	$ 7,466
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%