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Share-based Compensation - Stock Options and Restricted Stock Activity (Details) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Stock options    
Options Outstanding    
Balance at beginning of period (in shares) 1,037,068 1,137,017
Granted (in shares) 0 0
Exercised (in shares) 0 0
Lapsed or cancelled (in shares) (53,700) (99,949)
Balance at end of period (in shares) 983,368 1,037,068
Options exercisable at end of period (in shares) 982,368 914,929
Weighted Average Exercise Price    
Balance at beginning of year (in dollars per share) $ 102.36 $ 103.54
Granted (in dollars per share) 0 0
Exercised (in dollars per share) 0 0
Lapsed or cancelled (in dollars per share) 111.18 115.81
Balance at end of period (in dollars per share) 101.88 102.36
Options exercisable at end of period (in dollars per share) $ 101.88 $ 101.69
Restricted Stock Awards    
Options Outstanding    
Total fair value of options granted during the period $ 734,315 $ 11,131,181
Summary of restricted stock    
Balance at beginning of year (in shares) 3,566,466 3,452,016
Granted (in shares) 9,220 126,350
Cancelled (in shares) (26,043) (11,900)
Balance at end of period (in shares) 3,549,643 3,566,466
Vested during the period (in shares) 132,652 113,259