Incentive Compensation Plans (Stock Options, Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized	2,150,000
Number of shares available for grant	565,818
Proceeds from stock option exercises	$ 848,000	$ 1,300,000	$ 375,000
Closing stock price	$ 36.06
Aggregate intrinsic value of outstanding in-the-money stock options	5,600,000
Aggregate intrinsic value of outstanding exercisable in-the-money stock options	5,000,000
Aggregate intrinsic value of stock options exercised	929,000	1,600,000	549,000
Total fair value of stock option awards vested	1,400,000	1,500,000	2,100,000
Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	4 years
Award expiration period	10 years
Share-based compensation expense	1,500,000	1,600,000	1,600,000
Unrecognized share-based compensation expense	$ 3,800,000
Unrecognized share-based compensation expense, weighted-average period of recognition	2 years 10 months 24 days