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Stock Compensation Plans (Summary of Performance Based Equity Awards) (Details 11) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Performance-based TSR Awards [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Nonvested at beginning of period 86,917  
Weighted average grant-date fair value, beginning of period $ 24.68  
Granted 209,474  
Weighted average grant-date fair value, granted $ 20.08 $ 24.68
Vested 0  
Weighted average grant-date fair value, vested $ 0.00  
Forfeited 0  
Weighted average grant-date fair value, forfeited $ 0.00  
Nonvested at end of period 296,391 86,917
Weighted average grant-date fair value, end of period $ 21.43 $ 24.68
Performance-based Operational Award [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Nonvested at beginning of period 100,193  
Weighted average grant-date fair value, beginning of period $ 17.27  
Granted 215,258  
Weighted average grant-date fair value, granted $ 16.77  
Vested (100,193) [1]  
Weighted average grant-date fair value, vested $ 17.27  
Forfeited (5,784)  
Weighted average grant-date fair value, forfeited $ 16.77  
Nonvested at end of period 209,474  
Weighted average grant-date fair value, end of period $ 16.77  
Performance-based Operational Awards Granted in 2012 [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting level (percentage) 136.00%  
[1] During 2013, the 2012 annual Performance-based Operational Awards vested, and award holders received shares equivalent to 136% of the number of target-level shares.