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Stock-based Compensation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
9 Months Ended 0 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended
Sep. 30, 2013
Restricted Stock Awards (RSAs)
Sep. 30, 2012
Restricted Stock Awards (RSAs)
Mar. 01, 2013
Restricted Stock Unit Awards (RSUs)
Officers
Sep. 30, 2013
Restricted Stock Unit Awards (RSUs)
Officers
Sep. 30, 2013
Restricted Stock Unit Awards (RSUs)
Officers
Maximum
Sep. 30, 2013
Restricted Stock Unit Awards (RSUs)
Officers
Minimum
Sep. 30, 2013
Equity Incentive Plan
Sep. 30, 2012
Equity Incentive Plan
Sep. 30, 2013
Equity Incentive Plan
Sep. 30, 2012
Equity Incentive Plan
Apr. 27, 2005
Equity Incentive Plan
Sep. 30, 2013
Equity Incentive Plan
Restricted Stock Awards (RSAs)
Sep. 30, 2012
Equity Incentive Plan
Restricted Stock Awards (RSAs)
Sep. 30, 2013
Equity Incentive Plan
Restricted Stock Awards (RSAs)
Director
Sep. 30, 2013
Equity Incentive Plan
Restricted Stock Awards (RSAs)
Employees
Dec. 31, 2012
Equity Incentive Plan
Restricted Stock Awards (RSAs)
Employees
Sep. 30, 2013
Equity Incentive Plan
Restricted Stock Unit Awards (RSUs)
Sep. 30, 2013
Equity Incentive Plan
Restricted Stock Unit Awards (RSUs)
Officers
Stock-based Compensation                                    
Shares authorized to be issued under the plan                     2,000,000              
Awards granted (in shares) 72,891 98,422 50,267                              
Awards cancelled (in shares)                       0 0          
Vesting period                           12 months 36 months 48 months 3 years  
Weighted average grant date fair value (in dollars per share)                       $ 20.66 $ 17.96         $ 20.62
Expiration period of award       3 years                            
Options vested on anniversary date (as a percent)         200.00% 0.00%                        
Compensation expense                                    
Recorded compensation costs for the RSAs and RSUs             $ 0.5 $ 0.3 $ 1.3 $ 1.1