Share-Based Payment Arrangements (Summary of Option Activity) (Details) - Options [Member] - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Outstanding at Beginning	88,301
Number of Shares, Exercised	(35,317)
Number of Shares, Expired	(6,119)
Number of Shares, Outstanding at Ending	46,865	88,301
Number of Shares, Exercisable at Ending	46,685
Weighted Average Exercise Price, Outstanding at Beginning	$ 34.84
Weighted Average Exercise Price, Exercised	37.39
Weighted Average Exercise Price, Expired	42.82
Weighted Average Exercise Price, Outstanding at Ending	31.88	$ 34.84
Weighted Average Exercise Price, Exercisable at Ending	$ 31.88
Weighted Average Remaining Contractual Term (Years)	2 years 7 months 6 days	2 years 9 months 18 days
Weighted Average Remaining Contractual Term (Years), Exercisable at Ending	2 years 7 months 6 days
Aggregate Intrinsic Value, Outstanding at Beginning	$ 1,294
Aggregate Intrinsic Value, Exercised	592
Aggregate Intrinsic Value, Expired	10
Aggregate Intrinsic Value, Outstanding at Ending	164	$ 1,294
Aggregate Intrinsic Value, Exercisable at Ending	$ 164