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Stock-Based Compensation Plans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Stock-based compensation expense
Total stock-based compensation	$ 2,156	$ 1,898	$ 6,184	$ 4,997
Employee [Member]
Stock-based compensation expense
Total stock-based compensation	1,968	1,726	5,748	4,535
Restricted stock and performance shares [Member] \| Employee [Member]
Stock-based compensation expense
Total stock-based compensation	1,796	1,627	5,270	4,309
Stock options [Member] \| Employee [Member]
Stock-based compensation expense
Total stock-based compensation	172	99	478	226
Restricted stock [Member] \| Non employee director [Member]
Stock-based compensation expense
Total stock-based compensation	$ 188	$ 172	$ 436	$ 462

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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