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Stock Compensation Plans Stock Performance Rights (Details) (Stock Performance Rights, USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Eligibility minimum age requirement 65 years    
Weighted average estimated value of SPRs outstanding (per share)   $ 4.76  
Valuation assumptions:      
Expected volatility, minimum, percent 32.20%    
Expected volatility, maximum, percent 65.30%    
Risk-free rate of return, minimum 0.10%    
Risk-free rate of return, maximum 1.80%    
Expected annual dividend $ 0    
Allocated Share-based Compensation Expense (1,400,000) (600,000) (1,100,000)
Activity related to SPRs:      
Outstanding at beginning of period 516,700    
Granted 148,301    
Cancelled (45,732)    
Outstanding at end of period 619,269 516,700  
Exercisable at end of period 258,050    
Weighted average exercise price, outstanding, beginning of period $ 15.28    
Weighted average exercise price, granted $ 12.20    
Weighted average exercise price, cancelled $ 15.58    
Weighted average exercise price, outstanding, end of period $ 14.48 $ 15.28  
Weighted average exercise price, exercisable   $ 21.17  
SPRs outstanding, intrinsic value   1,500,000  
Total unrecognized compensation cost   $ 1,300,000  
Unrecognized cost, period for recognition 2 years 8 months 12 days    
SPRs vested in period 100,867    
Weighted average remaining contractual term, SPRs outstanding 5 years 10 months 24 days    
Weighted average remaining contractual term, SPRs exercisable 5 years 4 months 24 days    
Minimum
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Life of award 7 years    
Award vesting period 1 year    
Valuation assumptions:      
Expected term 8 months 12 days    
Maximum
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Life of award 10 years    
Award vesting period 3 years    
Valuation assumptions:      
Expected term 5 years 2 months 12 days