Share-Based Payment Arrangements (Summary of Option Activity) (Details)	3 Months Ended
	Mar. 31, 2016 USD ($) $ / shares shares
Share-Based Payment Arrangements [Abstract]
Number of Shares, Outstanding at Beginning | shares	745,806
Number of Shares, Cancelled/forfeited | shares	(49,610)
Number of Shares, Expired | shares	(137,139)
Number of Shares, Outstanding at Ending | shares	559,057
Number of Shares, Exercisable at Ending | shares	493,714
Weighted Average Exercise Price, Outstanding at Beginning | $ / shares	$ 37.55
Weighted Average Exercise Price, Cancelled/forfeited | $ / shares	34.61
Weighted Average Exercise Price, Expired | $ / shares	42.20
Weighted Average Exercise Price, Outstanding at Ending | $ / shares	36.67
Weighted Average Exercise Price, Exercisable at Ending | $ / shares	$ 37.57
Weighted Average Remaining Contractual Term (Years), Outstanding at Ending	4 years 2 months 9 days
Weighted Average Remaining Contractual Term (Years), Exercisable at Ending	3 years 11 months 12 days
Aggregate Intrinsic Value, Outstanding at Ending | $
Aggregate Intrinsic Value, Exercisable at Ending | $