Per Share Amounts and Common Shares Outstanding (Tables)

6 Months Ended

Jun. 30, 2018

Equity [Abstract]

Schedule of earnings per share, basic and diluted [Table Text Block]

The per share amounts were computed as follows:

	Three Months Ended				Six Months Ended
	June 30, 2018		July 1, 2017		June 30, 2018		July 1, 2017
Income available to common shareholders:
Net income	$	21,714	$	14,223	$	15,087	$	10,336
Weighted-average shares:
Basic:
Outstanding	22,926		24,797		24,077		24,582
Partially-paid share subscriptions	195		201		362		402
Basic weighted-average shares	23,121		24,998		24,439		24,984
Diluted:
Basic from above	23,121		24,998		24,439		24,984
Incremental shares from assumed:
Exercise of stock subscription purchase rights	140		141		143		143
Exercise of stock options and awards	1,046		846		979		871
Diluted weighted-average shares	24,307		25,985		25,561		25,998
Net income per share:
Basic	$	.94	$	.57	$	.62	$	.41
Diluted	$	.89	$	.55	$	.59	$	.40

Schedule of common and redeemable shares outstanding [Table Text Block]

A summary of the activity of the common and redeemable shares outstanding for the six months endedJune 30, 2018 follows:

	Common Shares		Redeemable
	Net of Treasury Shares		Shares		Total
Shares outstanding at January 1, 2018	17,753,832		6,467,027		24,220,859
Shares purchased	(828,495	)	(533,447	)	(1,361,942	)
Shares sold	369,171		235,195		604,366
Stock subscription offering -- cash purchases	51,296		—		51,296
Options and awards exercised	108,850		—		108,850
Shares outstanding at June 30, 2018	17,454,654		6,168,775		23,623,429