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LONG-TERM DEBT - Convertible Notes (Details)
9 Months Ended
Mar. 11, 2015
USD ($)
$ / shares
Sep. 30, 2018
USD ($)
$ / shares
Long-term debt    
Face amount of debt   $ 180,469,527
Unamortized debt discount of notes   1,977,286
4.50% Convertible Senior Notes due 2020    
Long-term debt    
Face amount of debt $ 75,000,000 $ 75,000,000
Stated interest rate (as a percent)   4.50%
Debt instrument conversion ratio 0.0145136 0.0145439
Conversion price per share | $ / shares $ 68.90 $ 68.58
Unamortized debt discount of notes $ 6,100,000 $ 2,000,000
Debt discount, cash portion 2,600,000  
Debt discount, equity component $ 3,500,000