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Basis of Presentation (Stock-Based Compensation) (Details) (USD $)
0 Months Ended 9 Months Ended
Mar. 11, 2014
Jan. 22, 2013
Sep. 30, 2014
equal_installments
Sep. 30, 2013
Stock-Based Compensation        
Tax benefit (expense) from equity based awards     $ 119,000 $ 68,000
Options granted (in shares)     0 0
Vested options (in shares)     245,186 307,521
Vested options, weighted average exercise price (in dollars per share)     $ 23.67 $ 23.28
Vested options, weighted average remaining contractual life     2 years 3 months 1 day  
Intrinsic value for vested options     594,000  
Intrinsic value for the total of all options exercised     41,000  
Maximum exercise period     10 years  
Cash received from options exercised     192,000 1,300,000
Long-Term Incentive Plan 2012
       
Stock-Based Compensation        
Number of shares for issuance under future awards     368,026  
Restricted Stock Units (RSUs)
       
Stock-Based Compensation        
Share-based compensation costs     2,700,000 1,500,000
Share-based unrecognized compensation costs     3,600,000  
Restricted Stock Units (RSUs) | Long-Term Incentive Plan 2005
       
Stock-Based Compensation        
Equity instruments other than options, granted (in shares) 67,190 72,595 33,304 13,100
Share-based compensation, award vesting periods     5 years  
Award vesting, number of equal installments     3  
Performance-Based Restricted Stock Units | Long-Term Incentive Plan 2005
       
Stock-Based Compensation        
Equity instruments other than options, granted (in shares) 32,645 40,990    
Stock Option
       
Stock-Based Compensation        
Share-based compensation costs     $ 0 $ 10,000
Options granted (in shares)     0 0
Stock Option | Prior to 2009
       
Stock-Based Compensation        
Share-based compensation, award vesting periods     5 years  
Typical options expiration period after date of grant     10 years  
Stock Option | Prior to 2009 | Period One
       
Stock-Based Compensation        
Share-based compensation, award vesting periods     3 years  
Stock Option | Prior to 2009 | Period Two
       
Stock-Based Compensation        
Share-based compensation, award vesting periods     4 years  
Stock Option | Prior to 2009 | Period Three
       
Stock-Based Compensation        
Share-based compensation, award vesting periods     5 years