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Compensation Plans Stock Option Grants Under the Equity Incentive Compensation Plan (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Aggregate Intrinsic Value      
Excess tax benefit $ 0 $ 0 $ 0
Cash received from exercise 3,200,000 3,000,000 5,000,000
Employee Stock Option [Member]
      
Shares      
Outstanding, start of year 267,846 508,214 920,765
Exercised (228,758) (240,368) (412,551)
Forfeited 0 0 0
Outstanding, end of year 39,088 267,846 508,214
Vested and exercisable at end of year 39,088 267,846 508,214
Weighted Average Exercise Price      
Outstanding, start of year (in dollars per share) $ 14.95 $ 13.86 $ 13.11
Exercised (in dollars per share) $ 13.92 $ 12.65 $ 12.19
Forfeited (in dollars per share) $ 0 $ 0 $ 0
Outstanding, end of year (in dollars per share) $ 20.87 $ 14.95 $ 13.86
Vested and exercisable at end of year (in dollars per share) $ 20.87 $ 14.95 $ 13.86
Aggregate Intrinsic Value      
Exercised 12,326,994 11,842,575 24,359,240
Outstanding 2,432,837 9,983,177 30,109,110
Vested and exercisable at end of year $ 2,432,837 $ 9,983,177 $ 30,109,110
Exercise Price Range 1 [Member] | Employee Stock Option [Member]
      
Aggregate Intrinsic Value      
Exercise Price $ 20.87 [1]    
Number of options outstanding and exercisable 39,088    
Weighted average remaining contractual life 1 year    
[1] Exercise price is equal to the weighted average exercise price.