XML 153 R138.htm IDEA: XBRL DOCUMENT v3.10.0.1
Stockholders' Equity (Common shares held in treasury, activity) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Stockholders' Equity Note [Abstract]      
Beginning of period 8,678,427 8,711,025 8,757,960
Common shares used for exercise of restricted stock units (Shares) (87,117) (32,598) (46,935)
End of period 8,591,310 8,678,427 8,711,025
Beginning of period $ 104,502 $ 104,860 $ 105,379
Common shares used for exercise of restricted stock units (Value) (869) (358) (519)
End of period $ 103,633 $ 104,502 $ 104,860