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Stock-Based Compensation (Activity in the Stock Plan) (Details) - shares
1 Months Ended 3 Months Ended 123 Months Ended 171 Months Ended
May 31, 2014
Mar. 31, 2019
Mar. 31, 2019
Mar. 31, 2019
Employee Stock Award Plan-2008        
Authorized Shares Available for Future Award Grants        
Beginning balance (in shares)   890,857 1,900,000  
Additional shares authorized (in shares) 1,500,000 0 1,500,000  
Number of awards granted (in shares)   (116,833) (3,139,900)  
Number of awards forfeited or expired (in shares)   26,145 540,069  
Ending balance (in shares)   800,169 800,169 800,169
Employee Stock Award Plan-2008 | Options Awards        
Authorized Shares Available for Future Award Grants        
Number of option awards exercised (in shares)   27,815 1,352,429  
Employee Stock Award Plan-2008 | Unrestricted Stock Awards        
Authorized Shares Available for Future Award Grants        
Number of awards granted (in shares)   0 (9,370)  
Employee Stock Award Plan-2008 | Restricted Stock Awards        
Authorized Shares Available for Future Award Grants        
Number of restricted stock awards vested (in shares)   41,468 99,661  
Director Plan - 2005        
Authorized Shares Available for Future Award Grants        
Beginning balance (in shares)   49,163   300,000
Number of awards granted (in shares)   0   (274,840)
Number of awards forfeited or expired (in shares)   0   24,003
Ending balance (in shares)   49,163 49,163 49,163
Director Plan - 2005 | Options Awards        
Authorized Shares Available for Future Award Grants        
Number of option awards exercised (in shares)   1,131   119,092
Number of restricted stock awards vested (in shares)   0   71,541