Stock-Based Compensation Plans Options (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Options Shares [Abstract]
Outstanding at beginning of year	1,477,626
Granted	361,543
Exercised	(98,014)
Expired	(155,934)
Forfeited	(37,591)
Outstanding at end of year	1,547,630	1,477,626
Exercisable at end of year	873,741
Weighted Average Exercise Price [Abstract]
Beginning of year	$ 78.04
Granted	69.59
Exercised	73.12
Expired	92.37
Forfeited	68.87
End of year	75.15	$ 78.04
Exercisable at end of year	$ 79.95
Weighted Average Remaining Contractual Term, Outstanding at end of year	2 years 10 months 9 days
Weighted Average Remaining Contractual Term, Exercisable at end of year	1 year 6 months 19 days
Aggregate Intrinsic Value, Outstanding at end of year	$ 7,639
Aggregate Intrinsic Value, Exercisable at end of year	$ 4,180
Weighted average grant date fair value of options	$ 21.58	$ 19.38	$ 17.37
Total intrinsic value of options exercised during the year	$ 1,200	$ 1,500	$ 1,600