Employee Benefit Plans (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Proceeds from exercise of stock options	$ 2.9	$ 0.5
Total intrinsic value of stock options exercised (less than 0.1 million for nine months ended 2012)	0.6	0.1
Stock-based compensation expense	0.2	0.2
Unrecognized stock-based compensation expense	0.4
Weighted-average period, unrecognized expense expected to be recognized	1 year 8 months 12 days
Stock-based compensation expense related to restricted shares	0.6	0.5
Total expense associated with the retirement benefit plan	0.6	0.5
Contributions made by company	0.5	0.6
Stock Appreciation Rights (SARs) [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Incentive stock options and SARs exercisable period	10 years
Stock Options [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Incentive stock options and SARs exercisable period	10 years
Non-Vested Restricted Shares [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Unrecognized stock-based compensation expense	$ 2.9
Weighted-average period, unrecognized expense expected to be recognized	4 years 1 month 6 days
Maximum [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Common stock issued upon the exercise of stock options, SARs and stock awards	750,000