Stock Options and Incentive Plans (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Stock Option Activity

Activity with respect to these plans is as follows:

	2017	2016	2015
Shares under option January 1	62,390	88,773	187,233
Options canceled	150	-	-
Options exercised	32,900	26,383	98,460
Shares under option at December 31	29,340	62,390	88,773
Options exercisable at December 31	29,340	62,390	88,773

The weighted average exercise price is as follows:

	2017	2016	2015
Shares under option January 1	$18.28	$18.67	$18.99
Options canceled	20.63	-	-
Options exercised	18.16	19.60	19.27
Shares under option December 31	18.40	18.28	18.67
Options exercisable December 31	18.40	18.28	18.67

Schedule of Executive Management Share-based Compensation Activity

Shares payable under these plans generally vest immediately prior to payment. As of December 31, 2017, there were 190,616 shares of Company stock authorized for the payment of awards under these plans. Information with respect to these plans is presented below:

	Number of shares		Weighted average grant date value per share	Year-end intrinsic value (000’s)
Shares potentially payable at January 1, 2015	185,199		$30.69	$5,683
Forfeitures	-		-
Payments	(95,889	)	$29.09
Shares accrued based on 2015 performance	98,998		$38.01
Shares potentially payable at December 31, 2015	188,308		$35.35	$6,657
Forfeitures	-		-
Payments	(86,926	)	$33.43
Shares accrued based on 2016 performance	88,036		$36.78
Shares potentially payable at December 31, 2016	189,418		$36.90	$6,989
Forfeitures	-		-
Payments	(75,545	)	$36.35
Shares accrued based on 2017 performance	43,532		$48.26
Shares potentially payable at December 31, 2017	157,405		$40.30	$6,343

Schedule of Other Management Share-based Compensation Activity

The determination of compensation expense for other management share-based compensation plans is based on the number of outstanding share units, the end-of-period share price, and Company performance. Information with respect to these plans is presented below:

	Number of shares		Weighted average grant date value per share	Cash paid for share based liabilities  (000’s)
Share units potentially payable at January 1, 2015	347,941
Grants	90,065
Changes due to performance	13,966
Payments	(167,482	)	$36.08	$6,040
Forfeitures	(31,624	)
Share units potentially payable at December 31, 2015	252,866
Grants	118,279
Changes due to performance	18,779
Payments	(88,073	)	$33.20	$2,924
Forfeitures	(40,706	)
Share units potentially payable at December 31, 2016	261,145
Grants	96,505
Changes due to performance	(11,891	)
Payments	(89,190	)	$46.64	$4,160
Forfeitures	(20,473	)
Share units potentially payable at December 31, 2017	236,096