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Stock-Based Compensation and Benefit Plans - Stock Option Activity and Associate Stock Purchase Plan (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Mar. 31, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]          
Number of Options, Beginning Balance 318,261 249,951   249,951  
Number of Options, Granted 6,668 99,605 6,200 106,273 37,200
Number of Options, Exercised      
Number of Options, Forfeited or Expired (34,549) (31,295)      
Number of Options, Ending Balance 290,380 318,261   290,380  
Number of Options, Exercisable 183,955     183,955  
Weighted Avg-Exercise Price, Beginning Balance $ 16.35 $ 19.80   $ 19.80  
Weighted Avg-Exercise Price, Granted 6.78 6.07      
Weighted Avg-Exercise Price, Exercised      
Weighted Avg-Exercise Price, Forfeited or Expired 16.18 12.15      
Weighted Avg-Exercise Price, Ending Balance 16.08 $ 16.35   16.08  
Weighted Average Price, Exercisable $ 19.78     $ 19.78  
Weighted Remaining Contractual Life (Years), Beginning Balance 3 years 8 months 12 days 3 years 11 months 12 days      
Weighted Remaining Contractual Life (Years), Ending Balance 3 years 9 months 26 days 3 years 8 months 12 days      
Weighted Remaining Contractual Life (Years), Exercisable, Balance 3 years 6 months 7 days        
Intrinsic Value, Balance ending $ 82,897 $ 121,741   $ 82,897  
Intrinsic Value, Exercisable, Balance $ 27,741     $ 27,741