Stock-Based Compensation Plans (Schedule of Compensation Expense Recognized in Connection with LTIP) (Details) (Long-Term Performance Share Plan [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Long-Term Performance Share Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 151	$ 200	$ 174
Related income tax benefit	53	70	61
Fair value of grants vested	$ 0	$ 497	$ 609