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Stock-Based Compensation Plans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Stock-based compensation expense
Total stock-based compensation	$ 2,066	$ 809	$ 4,028	$ 3,099
Employee [Member]
Stock-based compensation expense
Total stock-based compensation	1,967	692	3,780	2,809
Restricted stock and performance shares [Member] \| Employee [Member]
Stock-based compensation expense
Total stock-based compensation	1,806	860	3,474	2,682
Stock options [Member] \| Employee [Member]
Stock-based compensation expense
Total stock-based compensation	161	(168)	306	127
Restricted stock [Member] \| Non employee director [Member]
Stock-based compensation expense
Total stock-based compensation	$ 99	$ 117	$ 248	$ 290

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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