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Stock-Based Compensation Plans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Stock-based compensation expense
Total stock-based compensation	$ 1,997	$ 1,962
Employee [Member]
Stock-based compensation expense
Total stock-based compensation	1,846	1,813
Restricted stock and performance shares [Member] \| Employee [Member]
Stock-based compensation expense
Total stock-based compensation	1,649	1,668
Stock options [Member] \| Employee [Member]
Stock-based compensation expense
Total stock-based compensation	197	145
Restricted stock [Member] \| Non-employee directors [Member]
Stock-based compensation expense
Total stock-based compensation	$ 151	$ 149

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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