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Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2018

Stockholders' Equity [Abstract]

Schedule of Treasury Stock by Class [Table Text Block]

	Nine-Month Period Ended September 30,
	2018					2017
			Dollar					Dollar
	Shares		Amount			Shares		Amount
	(In thousands, except shares data)
Beginning of period	8,678,427		$	104,502		8,711,025		$	104,860
Common shares used upon lapse of restricted stock units	(58,424)			(796)		(32,598)			(358)
End of period	8,620,003		$	103,706		8,678,427		$	104,502