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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, 2012	Dec. 31, 2011	Dec. 31, 2010
Long-Term Performance Share Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Compensation expense	$ 174	$ 672	$ 526
Related income tax benefit	61	235	184
Fair value of grants vested	$ 609	$ 570	$ 327

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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