XML 121 R146.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Stockholders' Equity (Common shares held in treasury, activity) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Stockholders' Equity Note [Abstract]      
Beginning of year 8,591,310 8,678,427 8,711,025
Common shares used for exercise of restricted stock units (Shares) (105,032) (87,117) (32,598)
End of year 8,486,278 8,591,310 8,678,427
Beginning of period $ 103,633 $ 104,502 $ 104,860
Common shares used for exercise of restricted stock units (Value) (1,294) (869) (358)
End of period $ 102,339 $ 103,633 $ 104,502