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Stock-Based Compensation (Details)
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
employee
shares
Sep. 29, 2015
USD ($)
shares
Apr. 21, 2015
USD ($)
shares
Apr. 22, 2014
USD ($)
shares
Apr. 30, 2015
shares
Sep. 30, 2014
shares
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
shares
Sep. 30, 2014
USD ($)
shares
Stock Options                    
Stock-Based Compensation                    
Granted (in shares)                 0 0
Recognized stock-based compensation expense | $                 $ 0 $ 0
Unrecognized compensation costs related to unvested options | $ $ 0           $ 0   $ 0  
Stock Options | Directors                    
Stock-Based Compensation                    
Vested stock grants (in shares)     32,357 19,336            
Value of vested stock grants | $     $ 725,000 $ 491,000            
Stock Options | Former Executive                    
Stock-Based Compensation                    
Vested stock grants to number of former employees | employee 2                  
Vested stock grants (in shares)   8,624                
Value of vested stock grants | $   $ 200,000                
Restricted Stock Units                    
Stock-Based Compensation                    
Granted (in shares)                 3,963  
Recognized stock-based compensation expense | $             422,000 $ 679,000 $ 1,227,000 $ 2,129,000
Term of plan                 5 years  
Vested (in shares)                 58,816  
Unrecognized stock-based compensation costs | $ $ 3,217,000           3,217,000   $ 3,217,000  
Weighted average remaining recognition period of unrecognized stock-based compensation costs                 4 years  
Restricted Stock Units | Long-term incentive plan                    
Stock-Based Compensation                    
Forfeited (in shares)                 6,600 4,124
Performance share units                    
Stock-Based Compensation                    
Recognized stock-based compensation expense | $             340,000 $ 184,000 $ 946,000 $ 184,000
Unrecognized compensation costs related to unvested options | $ $ 6,929,000           $ 6,929,000   $ 6,929,000  
Vested (in shares) 0                  
Forfeited (in shares)                 4,009 0
Weighted average remaining recognition period of unrecognized stock-based compensation costs                 1 year 10 months 24 days  
Performance share units | Executive Management                    
Stock-Based Compensation                    
Granted (in shares)         103,600 91,054