Stock Incentive Plans (Changes in the Stock Options Outstanding) (Details) - Employee Stock Option [Member] - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018
Number of Options
Outstanding, at the beginning	86,611
Issued	420	65,888
Exercised	(5,975)
Expired	(12,262)
Outstanding, at the end	68,794
Options Exercisable	14,561
Weighted Average Exercise Price
Outstanding, at the beginning	$ 36.21
Issued	36.19
Exercised	(17.04)
Expired	16.56
Outstanding, at the end	41.37
Exercisable	$ 39.49
Aggregate Intrinsic Value
Exercised	$ 120
Outstanding at end	43
Exercisable	$ 33

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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