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Leadership Changes and Restructuring Activities (Details) - USD ($)
9 Months Ended 12 Months Ended
Jan. 07, 2016
Sep. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Severance, separation and restructuring          
Benefit period     24 months    
Share Based Compensation     $ 1,453,000 $ 2,002,000 $ 2,995,000
Restructuring Plan          
Severance, separation and restructuring          
Share Based Compensation     216,000 1,007,000  
Expenses related to severance and outplacement services     1,303,000 1,303,000  
Separation Agreement | Selling, Operating and Administrative Expenses [Member]          
Severance, separation and restructuring          
Severance and other related expenses     12,000 $ 3,545,000  
Share Based Compensation     1,007,000    
Restructuring and related cost, expected cost     3,581,000    
Former Chief Executive Officer Member | Separation Agreement          
Severance, separation and restructuring          
Benefit period       36 months  
Reserve for severance and related benefits, current     759,000 $ 500,000  
Reserve for severance and related benefits, noncurrent     789,000 1,488,000  
President Emeritus | Retirement Agreement          
Severance, separation and restructuring          
Share Based Compensation   $ 216,000      
Reserve for severance and related benefits, current     250,000    
Reserve for severance and related benefits, noncurrent     175,000    
Restructuring and related cost, expected cost   $ 877,000      
Restricted Stock Units (RSUs)          
Severance, separation and restructuring          
Share Based Compensation     1,453,000 $ 2,002,000 $ 247,000
Restricted Stock Units (RSUs) | Former Chief Executive Officer Member | Separation And Transition Agreement | Subsequent Event          
Severance, separation and restructuring          
Expenses related to severance and outplacement services $ 575,000        
Future share based compensation units to vest 12,109        
Restricted Stock Units (RSUs) | President Emeritus          
Severance, separation and restructuring          
Share Based Compensation     $ 216,000