Annual report pursuant to Section 13 and 15(d)

Share Based Compensation (Share Based Compensation Plans) (Details)

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Share Based Compensation (Share Based Compensation Plans) (Details) - shares
12 Months Ended
Jun. 02, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Restricted stock awards granted (in shares)   149,950 121,850 153,100
Restricted stock awards forfeited (in shares)   (4,230) 0 (2,444)
Director stock awards granted (in shares)   2,125 2,875 1,750
Stock Option Activities:        
Outstanding as of the beginning of year (in shares)   1,467,391 1,546,014 1,639,865
Granted (in shares) 846,353 165,650 142,550 1,013,893
Exercised (in shares)   (165,893) (220,694) (562,587)
Forfeited (in shares)   (5,200) 0 (3,374)
Expired (in shares)   (7,874) (479) (541,783)
Outstanding as of the end of year (in shares)   1,454,074 1,467,391 1,546,014
Employee Stock Purchase Plans shares issued (in shares)   44,383 45,251 36,552
Shares available for issuance under Share Incentive and Employee Stock Purchase Plans as of the end of year (in shares)   539,414 884,218 896,265