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Stock-Based Compensation (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Apr. 21, 2015
Apr. 22, 2014
Apr. 30, 2015
Sep. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
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  
Stock Options | Directors                
Stock-Based Compensation                
Vested stock grants to directors (in shares) 32,357 19,336            
Value of vested stock grants to directors $ 722,000 $ 491,000            
Restricted Stock Units                
Stock-Based Compensation                
Granted (in shares)             3,963  
Recognized stock-based compensation expense         403,000 $ 721,000 $ 805,000 $ 1,450,000
Term of plan             5 years  
Vested (in shares)             1,416 1,416
Unrecognized stock-based compensation costs         3,720,000   $ 3,720,000  
Weighted average remaining recognition period of unrecognized stock-based compensation costs             4 years 1 month 6 days  
Restricted Stock Units | Long-term incentive plan                
Stock-Based Compensation                
Forfeited (in shares)               4,124
Performance share units                
Stock-Based Compensation                
Recognized stock-based compensation expense         445,000   $ 606,000  
Unrecognized compensation costs related to unvested options         $ 7,806,000   $ 7,806,000  
Vested (in shares)             0  
Forfeited (in shares)             0  
Weighted average remaining recognition period of unrecognized stock-based compensation costs             2 years 1 month 6 days  
Performance share units | Executive Management                
Stock-Based Compensation                
Granted (in shares)     103,600 91,054