Share-Based Payment Arrangements (Summary of Option Activity) (Details) - Options [Member] $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Outstanding at Beginning | shares	745,806
Number of Shares, Exercised | shares	(67,251)
Number of Shares, Cancelled/Forfeited | shares	(71,450)
Number of Shares, Expired | shares	(150,847)
Number of Shares, Outstanding at Ending | shares	456,258
Number of Shares, Exercisable at Ending | shares	434,989
Weighted Average Exercise Price, Outstanding at Beginning | $ / shares	$ 37.55
Weighted Average Exercise Price, Exercised | $ / shares	31.93
Weighted Average Exercise Price, Cancelled/Forfeited | $ / shares	35.30
Weighted Average Exercise Price, Expired | $ / shares	46.06
Weighted Average Exercise Price, Outstanding at Ending | $ / shares	35.91
Weighted Average Exercise Price, Exercisable at Ending | $ / shares	$ 36.22
Weighted Average Remaining Contractual Term (Years), Outstanding at Ending	3 years 6 months
Weighted Average Remaining Contractual Term (Years), Exercisable at Ending	3 years 4 months 24 days
Aggregate Intrinsic Value, Exercised | $	$ 508
Aggregate Intrinsic Value, Cancelled/Forfeited | $	12
Aggregate Intrinsic Value, Outstanding at Ending | $	3,734
Aggregate Intrinsic Value, Exercisable at Ending | $	$ 3,449