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Employee Benefit Plans (Long Term Incentive Plan) (Details) (Performance Shares [Member], USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Third Amended and Restated Long Term Incentive Plan
 
Activity related to LTIPs:  
Outstanding, beginning of year 324,036
Additional LTIP awards granted due to achievement of performance criteria 147,574
LTIPs fully vested (442,721)
Outstanding, end of year 28,889
Weighted average grant date fair value:  
Outstanding, beginning of year - weighted average grant date fair value $ 39.78
Additional LTIP awards granted due to achievement of performance criteria - weighted average grant date fair value $ 39.44
Vested - weighted average grant date fair value $ (39.44)
Outstanding, end of year - weighted average grant date fair value $ 43.27
Additional disclosures:  
Intrinsic value $ 2,276
The rate at which performance awards are expensed 150.00%
Darwin LTIP
 
Additional disclosures:  
Vesting period 4 years