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Stock-based Compensation (Details) (Equity Incentive Plan, USD $)
In Millions, except Share data, unless otherwise specified
9 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
May 20, 2014
Apr. 27, 2005
Sep. 30, 2014
Restricted Stock Awards (RSAs)
Sep. 30, 2014
Restricted Stock Awards (RSAs)
Director
Sep. 30, 2014
Restricted Stock Awards (RSAs)
Employees
Dec. 31, 2013
Restricted Stock Awards (RSAs)
Employees
Sep. 30, 2014
Restricted Stock Unit Awards (RSUs)
Dec. 31, 2013
Restricted Stock Unit Awards (RSUs)
Sep. 30, 2014
Restricted Stock Unit Awards (RSUs)
Officers
Sep. 30, 2013
Restricted Stock Unit Awards (RSUs)
Officers
Sep. 30, 2014
Restricted Stock Unit Awards (RSUs)
Officers
Minimum
Sep. 30, 2014
Restricted Stock Unit Awards (RSUs)
Officers
Maximum
Stock-based Compensation                            
Shares authorized to be issued under the plan     2,000,000 2,000,000                    
Vesting period           12 months 36 months 36 months 3 years          
Weighted average grant date fair value (in dollars per share)         $ 23.61       $ 23.61 $ 20.62        
RSAs granted under the Equity Incentive Plan                            
Additions for new grants                     37,143 50,267    
Expiration period of award                     3 years 3 years    
Options vested on anniversary date (as a percent)                         0.00% 200.00%
Compensation expense                            
Recorded compensation costs for the RSAs and RSUs $ 1.5 $ 1.3